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Note 12 - Fair Value Measurements (Details) - USD ($)
Sep. 30, 2017
Mar. 31, 2017
Note 12 - Fair Value Measurements (Details) [Line Items]    
Derivative Liability, Noncurrent $ 5,000 $ 95,000
Warrants Held by Outside Investor [Member]    
Note 12 - Fair Value Measurements (Details) [Line Items]    
Warrants and Rights Outstanding $ 50,000  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share) $ 3.35  
Derivative Liability, Noncurrent   $ 95,000
Warrants Held by BCA [Member]    
Note 12 - Fair Value Measurements (Details) [Line Items]    
Derivative Liability, Noncurrent $ 5,000