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Note 9 - Stockholder's Equity - Warrants Outstanding and Exercisable (Details)
Dec. 31, 2015
$ / shares
shares
Common Stock Warrants Issued on Date 1 [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 2,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 100
Common Stock Warrants Issued on Date 2 [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 1,500
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 100
Common Stock Warrants Issued on Date 3 [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 1,200
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 100
Common Stock Warrants Issued on Date 4 [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 2,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 100
Common Stock Warrants Issued on Date 5 [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 1,200
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 100
Common Stock Warrants Issued on Date 6 [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 2,500
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 100
Common Stock Warrants Issued on Date 7 [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 3,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 100
Common Stock Warrants Issued on Date 8 [Member] | Tranche One [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 104,057
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 65
Common Stock Warrants Issued on Date 8 [Member] | Tranche Two [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 52,028
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 100
Common Stock Warrants Issued on Date 9 [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 5,300
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 65
Common Stock Warrants Issued on Date 10 [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 30,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 30
Common Stock Warrants Issued on Date 11 [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 10,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 75
Common Stock Warrants Issued on Date 12 [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 90,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 38
Common Stock Warrants Issued on Date 13 [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 173,917
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 3
Common Stock Warrants Issued on Date 14 [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 15,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 4.90
Common Stock Warrants Issued on Date 15 [Member] | Tranche One [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 832,950
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 4.80
Common Stock Warrants Issued on Date 15 [Member] | Tranche Two [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 277,650
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 4.80
Common Stock Warrants Issued on Date 15 [Member] | Tranche Three [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 35,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 4.80
Common Stock Warrants Issued on Date 15 [Member] | Tranche Four [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 351,060
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 2
Common Stock Warrants Issued on Date 16 [Member] | Tranche One [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 1,025,438
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 4.80
Common Stock Warrants Issued on Date 16 [Member] | Tranche Two [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 341,813
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 4.80
Common Stock Warrants Issued on Date 17 [Member] | Tranche One [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 261,693
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 4.80
Common Stock Warrants Issued on Date 17 [Member] | Tranche Two [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 89,731
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 4.80
Common Stock Warrants Issued on Date 18 [Member] | Tranche One [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 533,625
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 4.80
Common Stock Warrants Issued on Date 18 [Member] | Tranche Two [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 177,875
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 4.80
Common Stock Warrants Issued on Date 18 [Member] | Tranche Three [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 16,037
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 4.80
Common Stock Warrants Issued on Date 19 [Member] | Tranche One [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 15,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 4.80
Common Stock Warrants Issued on Date 19 [Member] | Tranche Two [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 5,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 4.80
Common Stock Warrants Issued on Date 20 [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 75,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 4.80
Common Stock Warrants Issued on Date 21 [Member]  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 250,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 3.75
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 4,781,574