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Note 9 - Segment Information - Revenues by Geographical Areas (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
UNITED STATES        
Revenues $ 67,209 $ 104,157 $ 113,215 $ 157,734
All Foreign Countries [Member]        
Revenues 670 441 1,299 951
Revenues $ 67,879 $ 104,598 $ 114,514 $ 158,685