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Note 9 - Earnings Per Share - Calculation of Basic and Diluted Weighted Average Common Shares (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Weighted average common shares outstanding basic earnings per share (in shares)	6,495,597	6,375,848
Effect of potential common share issuance:
Stock options (in shares)		11,616
Weighted average common shares outstanding
Diluted earnings per share (in shares)	6,495,597	6,387,464

X

- Definition

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.

+ References

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-Topic 260
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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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