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Note 9 - Basic and Diluted Earnings Per Common Share - Summary of Basic and Diluted Earnings Per Common Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator for basic and diluted earnings per common share:
Net income for the period	$ 4,741,279	$ 3,159,457	$ 13,250,303	$ 8,278,395
Basic weighted average number of common shares outstanding (in shares)	10,432,763	10,984,869	10,549,056	11,057,634
Effect of outstanding stock options (in shares)	186,242	387,813	187,719	412,023
Diluted weighted average number of shares outstanding (in shares)	10,619,005	11,372,682	10,736,775	11,469,657
Basic earnings per common share (in dollars per share)	$ 0.45	$ 0.29	$ 1.26	$ 0.75
Diluted earnings per common share (in dollars per share)	$ 0.45	$ 0.28	$ 1.23	$ 0.72

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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