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Note 13 - Capital Stock, Treasury Stock and Additional Paid-in Capital (Details Textual) - USD ($)					12 Months Ended
	Aug. 12, 2014	May 07, 2014	Feb. 14, 2014	Apr. 30, 2013	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Feb. 26, 2015	Nov. 26, 2014	Mar. 22, 2010
Stock Repurchase Program, Authorized Amount														$ 10,000,000	$ 15,000,000
Stock Repurchased During Period, Shares												1,205,229
Treasury Stock Acquired, Average Cost Per Share						$ 3.10	$ 5.46	$ 6.30			$ 4.05	$ 5.21
Treasury Stock, Shares, Acquired					0	657,113	2,372,097	843,022	0	0	551,646
Stock Issued During Period, Shares, New Issues	3,500,000	4,476,195	3,398,558	11,500,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Sale of Stock, Price Per Share	$ 10	$ 10.50	$ 9.71	$ 10
Proceeds from Issuance or Sale of Equity, Total	$ 35,000,000	$ 47,000,047	$ 32,999,998	$ 115,000,000
Proceeds from Issuance of Equity, Net of Issuance Costs	$ 34,071,501	$ 46,294,133	$ 31,937,044	$ 109,119,029
Stock Repurchase Program, Authorized Amount, Additional													$ 20,000,000

X

- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity, net of issuance costs.

+ References

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Additional amount of stock repurchase plan authorized.

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X

- Definition

Face amount or stated value per share of common stock.

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-Publisher FASB
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-SubTopic 10
-Section S99
-Paragraph 1
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The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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-SubTopic 10
-Section 45
-Paragraph 14
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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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Number of new stock issued during the period.

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Amount of stock repurchase plan authorized.

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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