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Note 14 - Share-based Compensation (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 24, 2021
May 31, 2021
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       85,500    
Proceeds from Stock Options Exercised       $ 461,000 $ 825,000 $ 136,000
Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture (in shares)       10,762 6,868 10,456
Share-Based Payment Arrangement, Employee [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)     54,000      
Share-Based Payment Arrangement, Nonemployee [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)     31,500      
Non-qualified Stock Options [Member] | Key Employees [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 25,000          
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Employee [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     5 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, Nonemployee [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)     5 years      
Non-vested Stock Options and Restricted Stock Units (RSUs) [Member]            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 148,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       3 years 9 months 18 days    
The 2014 Plan [Member]            
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)       1,100,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)       526,106    
The 2021 Plan [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)       0