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Note 10 - Equity Compensation (Details Textual)
12 Months Ended
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
shares
Nov. 30, 2019
shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | shares 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $   $ 200,000  
Proceeds from Stock Options Exercised | $ $ 26,000 987,000  
Reduction of Federal Income Taxes Payable Related To Stock Option Exercise | $ 200,000 100,000  
Reduction of Deferred Tax Asset Related to Stock Option Exercises | $ $ 100,000 $ 100,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) | shares 42,420 43,049  
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture | $   $ 300,000  
Deferred Compensation Arrangement with Individual, Shares Issued (in shares) | shares 494,047 193,510  
Deferred Compensation Plan With Rabbit Trust [Member]      
Treasury Stock, Shares, Total (in shares) | shares 821,876 345,875  
Treasury Stock, Value, Total | $ $ 5,900,000 $ 2,500,000  
Inducement RSUs [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | shares 146,281    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares   30,626  
Inducement PSUs [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | shares 190,980    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares   122,509  
Inducement Stock Option [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | shares   75,000  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 10 years    
Share-Based Payment Arrangement, Option [Member]      
Share-Based Payment Arrangement, Expense | $ $ 700,000 $ 800,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ $ 700,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 2 months 12 days    
Restricted Stock Units (RSUs) [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | shares 146,281    
Share-Based Payment Arrangement, Expense | $ $ 900,000 600,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ $ 900,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 10 months 24 days    
Dividends, Total | $ $ 65,743    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $ $ 700,000    
Performance Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares 190,980    
Share-Based Payment Arrangement, Expense | $ $ 1,600,000 600,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ $ 2,400,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 10 months 28 days    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 8.12    
Dividend, Share-Based Payment Arrangement, Cash | $ $ 104,978 $ 86,196  
The 2019 Omnibus Award Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | shares     2,650,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | shares 1,411,321    
Share-based Compensation Arrangement by Share-based Payment Award, Fungible Share Ratio 2.5    
The 2019 Omnibus Award Plan [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares 146,281    
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, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 8.13    
The 2019 Omnibus Award Plan [Member] | Performance Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares 190,980    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 8.12