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Note 7 - Stockholders' Equity (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 35 Months Ended
Jul. 17, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Nov. 30, 2016
Stock Repurchased During Period, Value       $ 23,000 $ 854,000    
Class of Warrant or Right, Exercised       27,311      
Class of Warrant or Right, Outstanding   0   0   0  
Temporary Equity, Dividends, Adjustment   $ 2,654,000 $ 2,654,000    
Warrant Exchange [Member]              
Warrant Exchange, Common Stock to be Received 0.385            
Class of Warrant or Right, Outstanding 9,935,000            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 3,824,959            
Temporary Equity, Dividends, Adjustment $ 2,700,000            
Warrants Exchanged in Consent Solicitation [Member]              
Non Warrant Exchange, Common Stock to be Received 0.36575            
Class of Warrant or Right, Outstanding 125,763            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 45,981            
Common Stock [Member]              
Stock Repurchased During Period, Shares       1,895 9,030    
Stock Repurchased During Period, Value          
Stock and Warrant Repurchase Plan [Member]              
Stock Repurchase Program, Number of Shares Authorized to be Repurchased             35,000,000
Warrants Repurchased During Period           6,011,926  
Warrants Repurchased During Period, Value           $ 14,700,000  
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 12,100,000   $ 12,100,000   $ 12,100,000  
Stock and Warrant Repurchase Plan [Member] | Common Stock [Member]              
Warrants Repurchased During Period       1,895      
Warrants Repurchased During Period, Value       $ 23,000      
Stock Repurchased During Period, Shares           866,701  
Stock Repurchased During Period, Value           $ 8,200,000