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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

Mar. 31, 2018

Mar. 31, 2017

Numerator for basic and diluted earnings per common share:

Net income for the period

$ 3,743,692

$ 2,446,491

^[1],[2]

Basic weighted average number of common shares outstanding (in shares)

10,588,718

10,474,647

^[2]

Effect of outstanding stock options (in shares)

203,895

301,868

Diluted weighted average number of shares outstanding (in shares)

10,792,613

10,776,515

^[2]

Basic earnings per common share (in dollars per share)

$ 0.35

$ 0.23

^[2]

Diluted earnings per common share (in dollars per share)

$ 0.35

$ 0.23

^[2]

[1]	The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.
[2]	The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.

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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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