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Note 15 - Earnings (Loss) Per Share - Basic and Diluted Earnings Per Share Calculation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income/(loss)	$ (1,218,237)	$ (7,798,300)	$ 2,566,678
Less: Undistributed earnings allocated to non-vested shares			(13,457)
Net income/(loss) attributable to common shareholders, basic	$ (1,218,237)	$ (7,798,300)	$ 2,553,221
Weighted average number of shares outstanding, basic and diluted (in shares)	39,809,364	39,824,038	41,315,127
Earnings/(loss) per share, basic and diluted (in dollars per share)	$ (0.03)	$ (0.20)	$ 0.06

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Amount of undistributed earnings (loss) allocated to participating securities for the diluted earnings (loss) per share or per unit calculation under the two-class method.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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