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Note 11 - Stock Awards - Stock Option Activity (Details) - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Outstanding, beginning of period (in shares)	318,000	272,550
Outstanding, beginning of period, average exercise price (in dollars per share)	$ 9.43	$ 8.21
Granted (in shares)	62,150	68,600
Granted, average exercise price (in dollars per share)	$ 11.71	$ 13.91
Exercised (in shares)		19,316
Exercised, average exercise price (in dollars per share)		$ 8.15
Expired (in shares)
Expired, average exercise price (in dollars per share)	$ 0	$ 0
Forfeited (in shares)	1,450	3,333
Forfeited, average exercise price (in dollars per share)	$ 11.05	$ 11.79
Options outstanding, end of period (in shares)	378,700	318,501
Options outstanding, end of period, average exercise price (in dollars per share)	$ 9.80	$ 9.41
Options exercisable, end of period (in shares)	249,300	208,633
Options exercisable, end of period, average exercise price (in dollars per share)	$ 8.71	$ 8.20

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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