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Note 12 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 16, 2025
Mar. 31, 2017
Oct. 31, 2007
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)       0 0 0 0
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount       $ 0   $ 0  
Share-Based Payment Arrangement, Nonemployee [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period       0 0 0 0
Share-Based Payment Arrangement, Expense       $ 0 $ 0 $ 0 $ 13
Employees and Directors [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       0   0  
Share-Based Payment Arrangement, Expense       $ 4 $ 22 $ 6 $ 137
Restricted Stock [Member] | Employees and Directors [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period         0   5,148
The 2007 Omnibus Incentive Plan [Member] | Maximum [Member] | Incentive Stock Options (ISOs) [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)     10 years        
The 2017 Omnibus Incentive Plan [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)   66,243          
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase in Shares Authorized, Percentage of Outstanding Common Stock   4.00%          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)       14,332   14,332  
The 2017 Omnibus Incentive Plan [Member] | Subsequent Event [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) 1,021,332            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) 1,000,000            
The 2017 Omnibus Incentive Plan [Member] | Incentive Stock Options (ISOs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percentage of Stock Owned by Shareholder, Minimum   10.00%          
The 2017 Omnibus Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)   4 years          
The 2017 Omnibus Incentive Plan [Member] | Maximum [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)   10 years          
The 2017 Omnibus Incentive Plan [Member] | Maximum [Member] | Incentive Stock Options (ISOs) [Member] | Shareholder of More Than 10% [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)   5 years          
The 2017 Omnibus Incentive Plan [Member] | Minimum [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent   100.00%          
The 2017 Omnibus Incentive Plan [Member] | Minimum [Member] | Incentive Stock Options (ISOs) [Member] | Shareholder of More Than 10% [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent   110.00%