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Note 17 - Segment Reporting - Depreciation and Amortization (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Depreciation and amortization $ 18,474 $ 17,485 $ 14,126
UNITED STATES      
Depreciation and amortization 13,267 12,533 11,596
Europe [Member]      
Depreciation and amortization 4,174 3,386 2,132
JAPAN      
Depreciation and amortization $ 1,033 $ 1,566 $ 398