Note 13 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill, Ending Balance	$ 96,326	$ 40,087
Goodwill, Impairment Loss	0
Acquired Finite-lived Intangible Asset, Residual Value	0
Amortization of Intangible Assets, Total	12,400	$ 8,600	$ 4,200
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	13,600
Finite-Lived Intangible Assets, Amortization Expense, Year Two	11,900
Finite-Lived Intangible Assets, Amortization Expense, Year Three	11,700
Finite-Lived Intangible Assets, Amortization Expense, Year Four	11,700
Finite-Lived Intangible Assets, Amortization Expense, Year Five	11,700
Cory and RDI Acquisitions [Member]
Goodwill, Ending Balance	56,300
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 53,900