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Note 17 - Net Earnings Per Common Share - Reconciliation of the Denominator Used to Calculate Earnings Per Common Share (Details) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Shares issued and outstanding at beginning of period (in shares)	38,648,461	38,504,311
Issued during the period (in shares)	181,523	91,754
Weighted average number of shares used in computing basic earnings per share (in shares)	38,829,984	38,596,065
Assumed exercise of stock options acquired under the Treasury Stock Method (in shares)	477,870	271,771
Number of shares used in computing diluted earnings per share (in shares)	39,307,854	38,867,836

X

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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X

- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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-Publisher FASB
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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