|
Note 2 - Significant Accounting Policies (Details) - Summary of Available-for-Sale Securities by Contractual Maturity (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Summary of Available-for-Sale Securities by Contractual Maturity [Abstract] | ||
| Less than one year | $ 51,338 | $ 56,789 |
| Less than one year | 51,319 | 56,806 |
| Greater than one year but less than five years | 6,050 | 12,537 |
| Greater than one year but less than five years | 6,044 | 12,535 |
| Total | 57,388 | 69,326 |
| Total | $ 57,363 | $ 69,341 |