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Note 7 - Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Jul. 31, 2020
Oct. 31, 2021
Aug. 31, 2020
Jul. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Treasury Stock, Shares, Acquired (in shares)     22,963 675 23,638  
Treasury Stock, Value, Acquired, Cost Method           $ 146,465
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)     $ 6.20 $ 6.21    
Nonvested Restricted Shares (in shares)         16,785  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)   4,166        
Option Indexed to Issuer's Equity, Strike Price (in dollars per share)   $ 8.04        
Stock Issued During Period, Value, Stock Options Exercised   $ 33,495     $ 33,494  
Publicly Announced Repurchase Plan [Member]            
Stock Repurchase Program, Period in Force (Year) 1 year          
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) 1,000,000     1,000,000    
Treasury Stock, Shares, Acquired (in shares)     23,638 675 0 23,638
Treasury Stock, Value, Acquired, Cost Method           $ 146,000
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)           $ 6.20