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Note 7 - Segment Reporting (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018
Number of Reportable Segments			2
Gross Profit, Total	$ 217,517	$ 200,334	$ 575,530	$ 520,734
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES
Concentration Risk, Percentage	78.00%	78.00%	75.00%	74.00%
Geographic Concentration Risk [Member] | Net Assets, Geographic Area [Member] | UNITED STATES
Concentration Risk, Percentage			81.00%		80.00%
Accounting Standards Update 2014-09 [Member] | Restatement Adjustment [Member]
Revenue from Contract with Customer, Including Assessed Tax		$ 2,873		$ 7,962
Gross Profit, Total		$ 2,449		$ 6,604

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