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Note 12 - Stockholders' Equity (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 01, 2020
shares
Oct. 05, 2017
Oct. 02, 2017
shares
May 25, 2016
Jun. 12, 2015
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
Dec. 31, 2020
$ / shares
shares
Mar. 31, 2021
$ / shares
Jun. 13, 2016
shares
Increase (Decrease) in Common Stock Shares Authorized (in shares)     (300,000,000)   100,000,000              
Common Stock, Shares Authorized (in shares)     100,000,000   300,000,000 100,000,000   100,000,000   100,000,000   400,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ / shares           $ 200,648   $ 200,648   $ 200,648    
Share-based Payment Arrangement, Option [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)           200,648   200,648   200,648    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ / shares                   $ 10.73 $ 10.73  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)               6 years 6 months 29 days   7 years 25 days    
Plan 2013 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) 219,500                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 1,160,500                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)           208,664   208,664   210,500    
Plan 2013 [Member] | Board of Directors [Member]                        
Share-based Payment Arrangement, Expensed and Capitalized, Amount, Total | $           $ 11,237 $ 7,500 $ 22,494 $ 15,000      
Reverse Stock Split [Member]                        
Stockholders' Equity Note, Stock Split, Conversion Ratio   10   10