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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Net income for the period	$ 3,439,266	$ 4,741,279	$ 11,127,241	$ 11,127,241	$ 13,250,303
Basic weighted average number of common shares outstanding (in shares)	10,564,311	10,432,763	10,522,841		10,549,056
Effect of outstanding stock options (in shares)	221,031	186,242	262,209		187,719
Diluted weighted average number of shares outstanding (in shares)	10,785,342	10,619,005	10,785,050		10,736,775
Basic earnings per common share (in dollars per share)	$ 0.33	$ 0.45	$ 1.06		$ 1.26
Diluted earnings per common share (in dollars per share)	$ 0.32	$ 0.45	$ 1.03		$ 1.23

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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