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Note 1 - Summary of Significant Accounting Policies (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |
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| Available-for-sale Securities (in Dollars) |
$ 173,574,000 |
$ 113,235,000 |
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| Deferred Revenue (in Dollars) |
1,700,000 |
1,600,000 |
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| Deferred Costs, Current (in Dollars) |
200,000 |
200,000 |
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Building and Building Improvements [Member] | Maximum [Member]
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| Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |
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| Property, Plant and Equipment, Useful Life |
40 years |
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Computer Equipment [Member] | Minimum [Member]
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| Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |
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| Property, Plant and Equipment, Useful Life |
3 years |
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Computer Equipment [Member] | Maximum [Member]
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| Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |
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| Property, Plant and Equipment, Useful Life |
7 years |
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Furniture and Fixtures [Member] | Minimum [Member]
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| Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |
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| Property, Plant and Equipment, Useful Life |
3 years |
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Furniture and Fixtures [Member] | Maximum [Member]
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| Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |
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| Property, Plant and Equipment, Useful Life |
5 years |
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Auction Rate Securities [Member]
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| Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |
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| Available-for-sale Securities (in Dollars) |
9,900,000 |
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Interest and Other Income, Net [Member]
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| Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |
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| Foreign Currency Transaction Gain (Loss), before Tax (in Dollars) |
$ 600,000 |
$ 100,000 |
$ 300,000 |
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Third Party Arrangements [Member] | Distributor Sales [Member]
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| Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |
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| Concentration Risk, Percentage |
91.00% |
91.00% |
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Small Distributor Purchase Orders [Member] | Distributor Sales [Member]
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| Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |
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| Concentration Risk, Percentage |
9.00% |
9.00% |
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Land Use Rights [Member]
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| Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |
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| Finite-Lived Intangible Asset, Useful Life |
50 years |
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Patents [Member]
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| Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |
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| Finite-Lived Intangible Asset, Useful Life |
5 years |
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Minimum [Member]
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| Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |
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| Property, Plant and Equipment, Useful Life |
3 years |
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| Term of Warranty |
1 year |
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| Vendor Payment Terms |
30 days |
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Maximum [Member]
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| Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |
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| Property, Plant and Equipment, Useful Life |
40 years |
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| Term of Warranty |
2 years |
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| Vendor Payment Terms |
45 years |
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