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Note 11 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended
Dec. 22, 2021
Mar. 31, 2024
Mar. 31, 2023
May 08, 2019
Restricted Stock [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period   50,000    
The 2019 Omnibus Incentive Plan [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant 26,072,542     11,072,542
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized 15,000,000      
Ownership Percentage 50.30%      
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures   525,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   3 years    
The 2019 Omnibus Incentive Plan [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Other Than Options, Grants in Period, Grant Date Fair Value   $ 77,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period   50,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 351,000    
Share-Based Payment Arrangement, Expense   $ 62,000 $ 45,000