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Note 14 - Stockholders' Equity (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Feb. 12, 2020	Feb. 13, 2019	Feb. 14, 2018
Stock Repurchased and Retired During Period, Value			$ 3,281
Stock Buyback Program 2020 [Member]
Stock Repurchase Program, Authorized Amount					$ 40,000
Stock Repurchased and Retired During Period, Shares (in shares)	0		70,238
Stock Repurchased and Retired During Period, Value			$ 3,300
Stock Buyback Program 2019 [Member]
Stock Repurchase Program, Authorized Amount						$ 40,000
Stock Repurchased and Retired During Period, Shares (in shares)		101,816	0	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 (in shares)				0

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