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Note 8 - Commitments and Contingencies (Details Textual) - USD ($)
1 Months Ended 6 Months Ended
Oct. 10, 2016
Sep. 25, 2014
May 15, 2013
Feb. 28, 2018
Dec. 31, 2018
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     $ 0.05                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance         7,152,225   6,827,225        
Class of Warrant or Right, Outstanding         16,300,000            
Pennvest Loan [Member]                      
Loss Contingency, Damages Sought, Value   $ 8,137,117                  
Minimum [Member]                      
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 0.60            
Maximum [Member]                      
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 3            
Exercise Bonus [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance         6,959,600            
Class of Warrant or Right, Outstanding         12,032,095            
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                    
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 $ 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         3,000,000 3,000,000          
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 0.60 $ 0.60          
Chief Executive Officer [Member] | Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]                      
Financing Receivable, Net, Total         $ 300,000 $ 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                 $ 0.75    
CEO and President [Member] | Exercise Bonus [Member]                      
ContingentStockBonusPercentageThresholdForIssuance     50.00%                
Extension of Exercise Period     5 years                
Extension of Exercise Period Annual Payment per Option or Warrant     $ 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] | Exercise Bonus [Member]                      
Execution Bonus as Percentage of Exercised Options and Warrants             75.00% 50.00%