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Note 7 - Stock Option Grant Activity (Details) - $ / shares
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Outstanding January 1, 2016 (in shares)   1,707,744 1,217,744 977,744
Outstanding January 1, 2016 (in dollars per share)   $ 0.84 $ 0.68 $ 0.60
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   1,301,084 490,000 240,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 1.25 $ 1.25 $ 1.25 $ 1
Expired (in shares)   (416,599)    
Outstanding June 30, 2016 (in shares) 2,592,229 2,592,229 1,707,744 1,217,744
Outstanding June 30, 2016 (in dollars per share) $ 1.04 $ 1.04 $ 0.84 $ 0.68