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Note 7 - Share-based Compensation - Stock Option Activity (Details)	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Options outstanding at beginning of year (in shares) | shares	764,430
Weighted average exercise price, options outstanding at beginning of year (in dollars per share) | $ / shares	$ 8.78
Number of shares, granted (in shares) | shares
Weighted average exercise price, granted (in dollars per share) | $ / shares
Number of shares, exercised (in shares) | shares
Weighted average exercise price, exercised (in dollars per share) | $ / shares
Number of shares, forfeited prior to vesting (in shares) | shares	(18,012)
Weighted average exercise price, forfeited prior to vesting (in dollars per share) | $ / shares	$ 10.84
Number of shares, canceled or expired (in shares) | shares	(1,482)
Weighted average exercise price, canceled or expired (in dollars per share) | $ / shares	$ 11
Options outstanding at March 31, 2018 (in shares) | shares	744,936
Weighted average exercise price, options outstanding at March 31, 2018 (in dollars per share) | $ / shares	$ 8.72
Options exercisable at end of March 31, 2018 (in shares) | shares	550,509
Weighted average exercise price, options exercisable at end of March 31, 2018 (in dollars per share) | $ / shares	$ 8.02

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.

+ References

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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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