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Note 14 - Stockholders' Equity (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Feb. 09, 2021	Feb. 13, 2020	Feb. 12, 2020	Feb. 14, 2019	Feb. 13, 2019
Stock Buyback Program 2021 [Member]
Stock Repurchase Program, Authorized Amount			$ 40.0
Stock Repurchased and Retired During Period, Shares (in shares)	0
Stock Buyback Program 2020 [Member]
Stock Repurchase Program, Authorized Amount		$ 3.1		$ 40.0	$ 40.0
Stock Repurchased and Retired During Period, Shares (in shares)	0	66,738
Stock Buyback Program 2019 [Member]
Stock Repurchase Program, Authorized Amount						$ 40.0	$ 40.0
Stock Repurchased and Retired During Period, Shares (in shares)		0

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