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Note 11 - Stock Compensation Plans (Details Textual) - USD ($)
 1 Months Ended 5 Months Ended 12 Months Ended
Mar. 31, 2023
Aug. 30, 2000
Dec. 31, 2020
Dec. 31, 2024
Dec. 31, 2023
May 31, 2022
Aug. 31, 2020
Jun. 30, 2015
Dec. 31, 2013
Mar. 31, 2013
Aug. 31, 2000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 0 $ 0            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       0 0            
The 2003 Plan [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized                   450,000  
Sharebased Compensation Arrangement By Sharebased Payment Award Number Of Options Ungranted                 197,500    
2003 Plan [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period 3 years                    
The 2015 Plan [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized               750,000      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) [1],[2]       0 0            
The Directors Plan [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized                     200,000
Sharebased Compensation Arrangement By Sharebased Payment Award Number Of Options Ungranted   60,000                  
Number Of Options Each Director Received At Each Annual Meeting   4,000                  
Options Vesting Percentage On First And Second Anniversary   50.00%                  
The Directors Plan [Member] | Director [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   5,000                  
The 2011 Non-employee Director Stock Option Plan [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized             200,000        
Three Independent Members of the Board of Directors [Member]                      
Share-Based Compensation Arrangement, Stock to be Granted Per Recipient, Value     $ 50,000                
The 2022 Stock Plan [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized           750,000          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) [2],[3],[4]       486,846 0            
Share-Based Payment Arrangement, Option [Member] | Minimum [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period       2 years              
Share-Based Payment Arrangement, Option [Member] | Maximum [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period       3 years              
Restricted Stock Units (RSUs) [Member]                      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 4,500,000              
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period       486,846              
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition       2 years 4 months 24 days              
[1] 2 The 2015 Incentive Stock Plan (the “2015 Plan”) was approved by shareholders in June 2015, which authorizes the issuance of up to 750,000 options to purchase shares of common stock to employees and key consultants and advisors.
[2] Indicates plans with stock options.
[3] 6  In May 2022, shareholders approved the 2022 Employee Stock Incentive Plan (the “2022 Plan”), which replaces the 2015 Plan and authorizes the issuance of 750,000 shares of common stock to employees. 486,846 shares have been granted under the plan as of December 31, 2024.
[4] Indicates plans with stock grants.