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Note 8 - Outstanding Stock Purchase Warrants (Details)
Dec. 31, 2015
$ / shares
shares
Warrants Expiration 1[Member]  
Number of Shares (in shares) | shares 16,666,666
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0.09
Warrants Expiration 2 [Member]  
Number of Shares (in shares) | shares 1,806,159
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1
Warrants Expiration 3 [Member]  
Number of Shares (in shares) | shares 45,000
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1
Warrants Expiration 4 [Member]  
Number of Shares (in shares) | shares 567,001
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1
Warrants Expiration 5 [Member]  
Number of Shares (in shares) | shares 2,690,666
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0.09
Warrant Expiration 6 [Member]  
Number of Shares (in shares) | shares 34,666,665
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0.11
Number of Shares (in shares) | shares 56,442,157
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0.14
Number of Shares (in shares) | shares 39,775,491
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0.16