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Note 12 - Fair Value Measurements (Details) - Warrants Held by Outside Investor [Member] - USD ($)
Dec. 31, 2018
Mar. 31, 2018
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 $ 23,000 $ 0