Note 15 - Deferred Revenue and Contingent Liability (Details) - Summary of Deferred Revenue Activity - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Summary of Deferred Revenue Activity [Abstract] | ||
| Beginning balance | $ 17,867 | $ 20,391 |
| Amortization | (2,468) | (6,790) |
| Additions | 3,365 | 4,283 |
| Impairment | (176) | (17) |
| Balance at December 31 | $ 18,588 | $ 17,867 |