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Note 10 - Segment Information - Revenues by Geographical Areas (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenues $ 81,422 $ 77,606 [1] $ 225,505 $ 199,765 [1]
UNITED STATES        
Revenues 81,152 76,711 223,943 197,044
All Foreign Countries [Member]        
Revenues $ 270 $ 895 $ 1,562 $ 2,721
[1] Prior periods have not been adjusted under the modified retrospective method for Topic 606.