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Note 11 - Stock-Based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Nov. 14, 2023
Nov. 01, 2022
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Jun. 30, 2023
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)     429,153      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)     100,000      
Share-Based Payment Arrangement, Expense     $ 700,000 $ 600,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)     9 months 10 days      
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)     5 years      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares)     0   0  
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount     $ 0      
Restricted Stock [Member]            
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)     429,153   433,528 429,376
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     144,500   10,819  
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount     $ 3,395,144      
Amended Equity Plan [Member]            
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)   600,000        
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)   2,600,000        
The 2010 Plan [Member]            
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)     100,000   100,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)     0      
The 2010 Plan [Member] | Restricted Stock [Member]            
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)     429,153      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grant Date Fair Value     $ 2,300,000 $ 2,200,000    
The 2010 Plan [Member] | Employee Stock Option            
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate     0.00%      
The 2010 Plan [Member] | Common Stock [Member]            
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)     473,026      
The 2023 Plan [Member] | Common Stock [Member]            
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 193,500