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Note 14 - Stockholders' Equity (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Feb. 12, 2020	Feb. 13, 2019	Feb. 14, 2018
Stock Repurchased and Retired During Period, Value	$ 3,117
Stock Buyback Program 2020 [Member]
Stock Repurchase Program, Authorized Amount			$ 40,000
Stock Repurchased and Retired During Period, Shares (in shares)	66,738
Stock Repurchased and Retired During Period, Value	$ 3,100
Stock Buyback Program 2019 [Member]
Stock Repurchase Program, Authorized Amount				$ 40,000
Stock Repurchased and Retired During Period, Shares (in shares)		0
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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