Note 12 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Feb. 15, 2019	Dec. 31, 2018
Goodwill, Ending Balance	$ 88,300		$ 88,300		$ 48,200	$ 40,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles					$ 45,800
Goodwill, Impairment Loss			0
Acquired Finite-lived Intangible Asset, Residual Value	0		0
Amortization of Intangible Assets, Total	3,500	$ 2,200	5,700	$ 4,300
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	12,100		12,100
Finite-Lived Intangible Assets, Amortization Expense, Year Two	12,700		12,700
Finite-Lived Intangible Assets, Amortization Expense, Year Three	11,200		11,200
Finite-Lived Intangible Assets, Amortization Expense, Year Four	10,800		10,800
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 10,800		$ 10,800