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Note 6 - Stock-based Compensation and Option Plans (Details Textual) - USD ($)
12 Months Ended
Apr. 01, 2018
Dec. 31, 2022
Dec. 31, 2021
Common Stock, Capital Shares Reserved for Future Issuance (in shares)   418,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)   0 0
Directors Plan 2005 [Member]      
Common Stock, Capital Shares Reserved for Future Issuance (in shares)   70,000,000  
Share-Based Payment Arrangement, Option [Member]      
Common Stock, Capital Shares Reserved for Future Issuance (in shares)   1,683,639  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   10 years  
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   (0) (0)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Target Payout Rate   100.00%  
Restricted Stock [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   1,664 3
Restricted Stock [Member] | Directors Plan 2005 [Member] | Share-Based Payment Arrangement, Nonemployee [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Amount Approved for Issuance Per Participant   $ 12,000