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Note 12 - Stock Based Compensation (Details Textual) - USD ($)
$ / shares in Units, Pure in Thousands
1 Months Ended 12 Months Ended
Feb. 02, 2022
Nov. 11, 2021
Aug. 16, 2021
Jan. 06, 2021
Dec. 11, 2020
Dec. 01, 2020
Jan. 09, 2020
Jan. 06, 2020
Nov. 14, 2017
Jan. 31, 2022
Dec. 31, 2020
Nov. 30, 2019
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Nov. 13, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)                         100,000 100,000   100,000
Share-Based Payment Arrangement, Expense                         $ 3,993,660 $ 3,892,883    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value                         $ 7.42 $ 7.42    
President and CEO [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)               100,000                
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)               $ 14.50                
Restricted Stock [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)                         316,334      
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount                         $ 3,120,996      
Restricted Stock [Member] | Share-Based Payment Arrangement, Employee [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)                         10,000      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     3 years                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     10,000                          
Share-Based Payment Arrangement, Option [Member] | President and CEO [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)               2 years                
The 2010 Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)                 500,000              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)                               2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)                         100,000 100,000 100,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                         0 0    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                         $ 0 $ 0    
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount                         $ 0      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)                         2 years 6 months      
The 2010 Plan [Member] | Restricted Stock [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)                         316,334 401,333 534,666  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grant Date Fair Value                         $ 3,500,000 $ 3,700,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                         160,500 205,833    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)                         245,499 339,166    
The 2010 Plan [Member] | Restricted Stock [Member] | Executives and Non-executive Directors [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)                         165,834      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   123,500     162,500             158,000        
The 2010 Plan [Member] | Restricted Stock [Member] | President and Chief Executive Officer [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)             2 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             75,000                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)       37,500                        
The 2010 Plan [Member] | Restricted Stock [Member] | Two Employees [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)         3 years                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)           20,000                    
The 2010 Plan [Member] | Restricted Stock [Member] | Chief Executive Officer [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)         23,333         15,000 23,333          
The 2010 Plan [Member] | Restricted Stock [Member] | Four Employees [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 12,000                              
The 2010 Plan [Member] | Share-Based Payment Arrangement, Option [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)                         5 years      
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate                         0.00%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                         0 0