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Note 15 - Stockholders' Equity (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		18 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Feb. 12, 2020	Feb. 13, 2019	Feb. 14, 2018
Stock Repurchased and Retired During Period, Value	$ 164			$ 3,281
Stock Buyback Program 2020 [Member]
Stock Repurchase Program, Authorized Amount					$ 40,000
Stock Repurchased and Retired During Period, Shares (in shares)	3,500	70,238
Stock Repurchased and Retired During Period, Value	$ 200	$ 3,300
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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