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Note 9 - Earnings Per Common Share - Summary of Basic and Diluted Earnings Per Common Share (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net income for the period	$ 2,446,491	$ 4,438,238
Basic weighted average number of common shares outstanding (in shares)	10,474,647	10,674,036
Effect of outstanding stock options (in shares)	301,868	187,546
Diluted weighted average number of shares outstanding (in shares)	10,776,515	10,861,582
Basic earnings per common share (in dollars per share)	$ 0.23	$ 0.42
Diluted earnings per common share (in dollars per share)	$ 0.23	$ 0.41

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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