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Note 14 - Stockholders' Equity (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Feb. 14, 2019	Feb. 14, 2018	Mar. 01, 2017
Stock Repurchased and Retired During Period, Value	$ 4,986		$ 4,986
Stock Buyback Program 2019 [Member]
Stock Repurchase Program, Authorized Amount					$ 40,000
Stock Repurchased and Retired During Period, Shares	101,816		101,816
Stock Repurchased and Retired During Period, Value	$ 5,000		$ 5,000
Stock Buyback Program 2018 [Member]
Stock Repurchase Program, Authorized Amount						$ 40,000
Stock Repurchased and Retired During Period, Shares		0	0	0
Stock Buyback Program 2017 [Member]
Stock Repurchase Program, Authorized Amount							$ 40,000
Stock Repurchased and Retired During Period, Shares				0

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