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Note 2 - Stock-based Compensation - Stock Option Activity (Details) - Jun. 30, 2015 - USD ($)
Total
Outstanding at beginning of period (in shares) 349,983
Outstanding at beginning of period (in dollars per share) $ 10.97
Exercised (in shares) (55,000)
Exercised (in dollars per share) $ 8
Outstanding and vested at end of period (in shares) 294,983
Outstanding and vested at end of period (in dollars per share) $ 11.53
Outstanding and vested at end of period 2 years 25 days
Outstanding and vested at end of period $ 248,597