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Note 2 - Cash, Cash Equivalents and Investments (Details) - Discounted Cash Flow Model Values
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Dec. 31, 2013
|
Dec. 31, 2012
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|---|---|---|
| Defined Benefit Plan Disclosure [Line Items] | ||
| Time-to-liquidity (months) | 24 | 24 |
| Expected return | 2.50% | 1.80% |
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Minimum [Member]
|
||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Discount rate | 3.30% | 2.50% |
|
Maximum [Member]
|
||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Discount rate | 8.10% | 7.30% |