Note 13 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Nov. 30, 2020	Nov. 20, 2020
Goodwill, Ending Balance	$ 105,367	$ 96,326	$ 40,100
Goodwill, Impairment Loss	0
Acquired Finite-lived Intangible Asset, Residual Value	0
Amortization of Intangible Assets, Total	13,800	12,400	$ 8,600
Finite-Lived Intangible Asset, Expected Amortization, Year One	14,000
Finite-Lived Intangible Asset, Expected Amortization, Year Two	13,700
Finite-Lived Intangible Asset, Expected Amortization, Year Three	13,700
Finite-Lived Intangible Asset, Expected Amortization, Year Four	13,700
Finite-Lived Intangible Asset, Expected Amortization, Year Five	13,600
Mass Movement, Inc. [Member]
Goodwill, Ending Balance	9,100			$ 8,800	$ 8,800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 14,000			$ 14,000
Cory and RDI Acquisitions [Member]
Goodwill, Ending Balance		$ 56,200