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Note 12 - Stock Option Plans (Details) - Fair Value of Stock Options Granted - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value of Stock Options Granted [Abstract]      
Volatility 44.10% 56.10% 69.40%
Risk-free interest rate 1.30% 1.30% 1.10%
Expected life (in years) 4 years 4 years 4 years
The weighted average grant date fair value for options issued, with the exercise price equal to market value on the date of grant (in Dollars per share) $ 7.40 $ 7.02 $ 4.52