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Note 9 - Stock Option Plans (Details) - Fair Value of Stock Options Granted (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Fair Value of Stock Options Granted [Abstract]      
Volatility 69.40% 52.10% 73.70%
Risk-free interest rate 1.10% 0.50% 0.80%
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) $ 4.52 $ 2.24 $ 1.52