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Note 6 - Stockholders' Equity (Details) - Activity of Stock Option Plan (USD $)
3 Months Ended
Mar. 31, 2014
Activity of Stock Option Plan [Abstract]  
Outstanding at December 31, 2013 1,197,044
Outstanding at December 31, 2013 $ 3.79
Forfeited or expired (201,744)
Forfeited or expired $ 2.05
Outstanding at March 31, 2014 995,300
Outstanding at March 31, 2014 $ 4.15
Exercisable at March 31, 2014 629,293
Exercisable at March 31, 2014 $ 6.19