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Note 9 - Commitments and Contingencies (Details Textual) - USD ($)
1 Months Ended
Oct. 10, 2016
Feb. 10, 2015
Sep. 25, 2014
May 15, 2013
Feb. 28, 2018
Dec. 31, 2020
Jun. 30, 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                    
Class of Warrant or Right, Outstanding (in shares)           21,300,000                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)           9,511,600 9,511,600              
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]                            
Execution Bonus as Percentage of Exercised Options and Warrants           75.00%                
Class of Warrant or Right, Outstanding (in shares)           15,317,000                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)           9,354,600                
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%                
Exercise Bonus [Member] | Bassani Warrants [Member]                            
Class of Warrant or Right, Outstanding (in shares)           3,000,000                
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                       $ 300,000 $ 125,000  
Deferred Compensation, Stock Conversion, Price Per Share (in dollars per share)                       $ 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           $ 329,626     $ 300,000          
Note Receivable, Collateral                 $ 300,000          
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%