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Note 9 - Commitments and Contingencies (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Oct. 10, 2016
Feb. 10, 2015
Sep. 25, 2014
May 15, 2013
Feb. 28, 2018
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Aug. 01, 2018
Apr. 27, 2017
Oct. 31, 2016
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 0.75          
Extension of Exercise Period Annual Payment per Option or Warrant (in dollars per share)       $ 0.05              
Class of Warrant or Right, Outstanding (in shares)           21,900,000          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)           10,471,600 9,511,600 7,411,600      
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)           $ 1.50          
Exercise Bonus [Member]                      
Execution Bonus as Percentage of Exercised Options and Warrants           75.00%          
Class of Warrant or Right, Outstanding (in shares)           16,742,789          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)           10,326,600          
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                    
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           $ 335,965     $ 300,000    
Repayments of Long-term Debt, Total           $ 155,000 $ 135,000        
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]                      
Contingent Stock Bonus Percentage, Threshold for Issuance       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