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Note 7 - Segment Reporting (Details Textual) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018
Number of Reportable Segments			2
Gross Profit, Total	$ 195,838	$ 178,473	$ 358,013	$ 320,400
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES
Concentration Risk, Percentage	74.00%	73.00%	73.00%	72.00%
Geographic Concentration Risk [Member] | Net Assets, Geographic Area [Member] | UNITED STATES
Concentration Risk, Percentage			80.00%		80.00%
Accounting Standards Update 2014-09 [Member] | Restatement Adjustment [Member]
Revenue from Contract with Customer, Including Assessed Tax		$ 2,632		$ 5,089
Gross Profit, Total		$ 2,217		$ 4,155

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