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Note 10 - Commitments and Contingencies (Details Textual) - USD ($)
1 Months Ended
Oct. 10, 2016
Feb. 10, 2015
Sep. 25, 2014
May 15, 2013
Feb. 28, 2018
Mar. 31, 2020
Jun. 30, 2019
Aug. 01, 2018
Jun. 30, 2018
Jun. 30, 2017
Apr. 27, 2017
Oct. 31, 2016
Jun. 30, 2014
Extension of Exercise Period Annual Payment per Option or Warrant (in dollars per share)       $ 0.05                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)           7,716,600 7,411,600            
Class of Warrant or Right, Outstanding (in shares)           19,400,000              
Pennvest Loan [Member]                          
Loss Contingency, Damages Sought, Value     $ 8,137,117                    
Minimum [Member]                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 0.60              
Maximum [Member]                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 2              
Exercise Bonus [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)           7,604,600              
Class of Warrant or Right, Outstanding (in shares)           12,175,411              
Exercise Bonus [Member] | Minimum [Member]                          
Execution Bonus as Percentage of Exercised Options and Warrants           50.00%              
Exercise Bonus [Member] | Maximum [Member]                          
Execution Bonus as Percentage of Exercised Options and Warrants           90.00%              
President [Member]                          
Monthly Officers' Cash Compensation $ 18,000                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 0.75              
President [Member] | FY2016 Extension Agreement [Member] | Extension Bonus [Member]                          
Deferred Compensation, Maximum Convertible Amount $ 125,000                   $ 300,000 $ 125,000  
Deferred Compensation, Stock Conversion, Price Per Share (in dollars per share) $ 0.75                   $ 0.75 $ 0.75  
President [Member] | February 2018 Extension Agreement [Member] | Extension Bonus [Member]                          
Annual Salary         $ 372,000                
Monthly Compensation, Life Insurance         $ 2,000                
Chief Executive Officer [Member]                          
Monthly Officers' Cash Compensation   $ 31,000                      
Chief Executive Officer [Member] | Warrants Expiring on December 31, 2025 [Member]                          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)               3,000,000          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)               $ 0.60          
Chief Executive Officer [Member] | Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]                          
Financing Receivable, after Allowance for Credit Loss, Total               $ 300,000          
Note Receivable, Collateral               $ 300,000          
Principle and Interest Receivable           $ 319,956              
Chief Executive Officer [Member] | Stock Bonus [Member]                          
Execution Bonus as Percentage of Exercised Options and Warrants       50.00%                  
Chief Executive Officer [Member] | FY2016 Extension Agreement [Member] | Extension Bonus [Member]                          
Deferred Compensation, Maximum Convertible Amount                     $ 300,000    
Deferred Compensation, Stock Conversion, Price Per Share (in dollars per share)                     $ 0.75    
CEO and President [Member] | Exercise Bonus [Member]                          
ContingentStockBonusPercentageThresholdForIssuance       50.00%                  
Extension of Exercise Period (Year)       5 years                  
Extension of Exercise Period Annual Payment per Option or Warrant (in dollars per share)       $ 0.01                  
Executive Vice Chairman and Other Board Member [Member] | Exercise Bonus [Member]                          
Execution Bonus as Percentage of Exercised Options and Warrants                         50.00%
Two Former Employees [Member] | Exercise Bonus [Member]                          
Execution Bonus as Percentage of Exercised Options and Warrants                 50.00%        
CEO, President, and Executive Vice Chairman [Member]                          
Execution Bonus, Annual Payment Per Option or Warrant (in dollars per share)             $ 0.01            
CEO, President, and Executive Vice Chairman [Member] | Exercise Bonus [Member]                          
Execution Bonus as Percentage of Exercised Options and Warrants                 75.00% 50.00%