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Note 12 - Stock Option Activity (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Outstanding (in shares) | shares 86,348
Outstanding (in dollars per share) | $ / shares $ 11.09
Exercised (in shares) | shares (20,250)
Exercised (in dollars per share) | $ / shares $ 11.65
Outstanding (in shares) | shares 66,098
Outstanding (in dollars per share) | $ / shares $ 10.92
Outstanding 4 years 36 days
Outstanding | $ $ 1,101,716 [1]
Fully vested and exercisable at December 31, 2015 (in shares) | shares 37,893
Fully vested and exercisable at December 31, 2015 (in dollars per share) | $ / shares $ 10.93
Fully vested and exercisable at December 31, 2015 2 years 182 days
Fully vested and exercisable at December 31, 2015 | $ $ 631,168 [1]
[1] The intrinsic value of a stock option is the amount by which the market value of the underlying stock exceeds the exercise price of the option. The per share market value of our common stock, as determined by the closing price on December 31, 2015, was $27.59.