Note 9 - Segment Information - Revenues by Geographical Areas (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| UNITED STATES | ||||
| Revenues | $ 68,462 | $ 106,300 | $ 181,677 | $ 264,034 |
| All Foreign Countries [Member] | ||||
| Revenues | 844 | 754 | 2,143 | 1,705 |
| Revenues | $ 69,306 | $ 107,054 | $ 183,820 | $ 265,739 |