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Note 3 - Revenue (Details Textual) - USD ($) $ in Thousands	3 Months Ended
Note 3 - Revenue (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Revenue from Contract with Customer, Including Assessed Tax	$ 107,745	$ 80,167
Cost of Goods and Services Sold, Total	49,837	$ 34,894
Accounts Receivable, Net, Current, Total	58,464			$ 51,503
Inventory, Net, Total	9,506			$ 11,271
Accounting Standards Update 2014-09 [Member]
Revenue from Contract with Customer, Including Assessed Tax	400
Cost of Goods and Services Sold, Total	200
Accounts Receivable, Net, Current, Total	2,900
Inventory, Net, Total	$ (1,300)
Retained Earnings [Member] \| Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 1,500