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Note 8 - Common Stock - Activity of Stock Option Plan (Details)
9 Months Ended
Sep. 30, 2015
$ / shares
shares
Outstanding at December 31, 2014 (in shares) 1,183,100
Outstanding at December 31, 2014 (in dollars per share) | $ / shares $ 3.50
Granted (in shares) 41,400
Granted (in dollars per share) | $ / shares $ 0.15
Forfeited or expired (in shares) (68,000)
Forfeited or expired (in dollars per share) | $ / shares $ 1.50
Outstanding at September 30, 2015 (in shares) 1,156,500
Outstanding at September 30, 2015 (in dollars per share) | $ / shares $ 3.50
Exercisable at September 30, 2015 (in shares) 720,094
Exercisable at September 30, 2015 (in dollars per share) | $ / shares $ 5.42