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Note 13 - Common Shares (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 09, 2021	Feb. 13, 2020	Feb. 12, 2020	Feb. 13, 2019	Feb. 14, 2018
Common Stock, Shares Authorized (in shares)	250,000,000	250,000,000
Common Stock, Shares, Outstanding, Ending Balance (in shares)	10,612,414	10,585,159
Stock Repurchased and Retired During Period, Shares (in shares)	70,238	101,816	0
Stock Repurchased and Retired During Period, Value	$ 3,281	$ 4,986	$ 0
Stock Buyback Program 2021 [Member] | Subsequent Event [Member]
Stock Repurchase Program, Authorized Amount				$ 40,000
Stock Buyback Program 2020 [Member]
Stock Repurchase Program, Authorized Amount					$ 40,000	$ 40,000
Stock Repurchased and Retired During Period, Shares (in shares)	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)	0	101,816
Stock Repurchased and Retired During Period, Value		$ 5,000
Stock Buyback Program 2018 [Member]
Stock Repurchase Program, Authorized Amount								$ 40,000
Stock Repurchased and Retired During Period, Shares (in shares)		0

X

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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