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Note 9 - Stock-based Compensation Expense (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Oct. 11, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Aug. 31, 2022
Dec. 31, 2021
Share-Based Payment Arrangement, Expense   $ 118,548 $ 105,491 $ 307,379 $ 217,942    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       178,500      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)       $ 3.17      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)   678,000   678,000      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)   290,500   290,500      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       0      
Director [Member]              
Share-Based Payment Arrangement, Expense $ 40,000            
The 2016 Share Incentive Plan [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       102,500      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)   457,000   457,000     398,500
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)   145,500   145,500      
The 2022 Equity Incentive Plan [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       76,000      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)   76,000   76,000     0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)   0   0      
Stock Options and Restricted Stock [Member] | The 2016 Share Incentive Plan [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)   47,698   47,698      
Stock Options and Restricted Stock [Member] | The 2022 Equity Incentive Plan [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)   439,000   439,000      
Stock Options and Restricted Stock [Member] | Maximum [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)           515,000  
Share-Based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       4 years      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       10 years      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 1,000,000.0   $ 1,000,000.0      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       3 years 3 months 18 days      
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche One [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       25.00%      
Restricted Stock [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       0      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 40,000   $ 40,000      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)       5,500      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)   0   0     5,500
Restricted Stock [Member] | Director [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares)   32,000   32,000      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value   $ 160,000   $ 16,000      
Restricted Stock [Member] | Vesting on August 17, 2022 [Member] | Director [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   16,000   160,000      
Restricted Stock [Member] | Vesting on December 31, 2022 [Member] | Director [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)   16,000   16,000      
Restricted Stock Units (RSUs) [Member]              
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 0   $ 0      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value       $ 3,458