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Note 11 - Stockholders' Equity (Details Textual) - USD ($)
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Share-Based Payment Arrangement, Expense $ 56,793 $ 71,375
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture $ 9,003 $ 12,002
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) 0 0
Class of Warrant or Right, Issued During Period (in shares) 0 0
Common Stock [Member]    
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)   2,222
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in shares) 316 1,102
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares) 4,287 855
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture $ 0 $ 0
Common Stock [Member] | Director [Member]    
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares) 4,287 855
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture $ 9,003 $ 12,002
Restricted Stock [Member]    
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares) 0 2,222
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value $ 0 $ 31,200
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in shares) 316 1,102
Share-Based Payment Arrangement, Expense $ 47,791 $ 62,474