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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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income for the period	$ 5,241,484	$ 4,070,786	$ 7,687,975	$ 8,509,024
Basic weighted average number of common shares outstanding (in shares)	10,528,219	10,541,659	10,501,407	10,607,843
Effect of outstanding stock options (in shares)	264,812	192,201	284,278	189,615
Diluted weighted average number of shares outstanding (in shares)	10,793,031	10,733,860	10,785,685	10,797,458
Basic earnings per common share (in dollars per share)	$ 0.50	$ 0.39	$ 0.73	$ 0.80
Diluted earnings per common share (in dollars per share)	$ 0.49	$ 0.38	$ 0.71	$ 0.79

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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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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