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Note 10 - Common Shares (Details Textual) - USD ($)		3 Months Ended	12 Months Ended
	Jan. 07, 2015	Dec. 31, 2015	Feb. 14, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Mar. 01, 2017	Feb. 09, 2016	Feb. 11, 2015
Common Stock, Shares Authorized				250,000,000	250,000,000
Common Stock, Shares, Outstanding				10,583,879	10,461,574
Stock Repurchased and Retired During Period, Shares					308,416	1,062,456
Stock Repurchased and Retired During Period, Value					$ 7,180,257	$ 23,616,286
Stock Buyback Program 2018 [Member] | Subsequent Event [Member]
Stock Repurchase Program, Authorized Amount			$ 40,000,000
Stock Buyback Program 2017 [Member]
Stock Repurchase Program, Authorized Amount							$ 40,000,000
Stock Buyback Program 2017 [Member] | Subsequent Event [Member]
Stock Repurchased and Retired During Period, Shares			0
Stock Buyback Program 2016 [Member]
Stock Repurchase Program, Authorized Amount								$ 40,000,000
Stock Repurchased and Retired During Period, Shares					308,416
Stock Repurchased and Retired During Period, Value					$ 7,200,000
Stock Buyback Program 2015 [Member]
Stock Repurchase Program, Authorized Amount									$ 20,000,000
Stock Repurchased and Retired During Period, Shares		231,047				868,549
Stock Repurchased and Retired During Period, Value		$ 5,400,000				$ 20,000,000
Tender Offer [Member]
Stock Repurchased and Retired During Period, Shares	193,907
Stock Repurchased and Retired During Period, Value	$ 3,600,000
Treasury Stock Acquired, Average Cost Per Share	$ 18.50
Stock Repurchased Transaction Costs	$ 100,000

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- Definition

Represents transaction costs for repurchase of equity.

+ References

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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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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Total cost of shares repurchased divided by the total number of shares repurchased.

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