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Note 9 - Additional Information for Stock Options (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Weighted average fair value of options granted (in dollars per share) $ 0.09 $ 0.14 $ 0.43
Intrinsic value of options exercised $ 0 $ 0 $ 0
Total fair value of options vested $ 66,622 $ 97,707 $ 165,490