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Reconciliation of basic shares to diluted shares and the computation of basic and diluted net income per share (Details) - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Numerator:    
Net income (loss) $ (993,420) $ 341,933
   Net income allocated to restricted stock award 121,264 31,752
   Adjusted net income (loss) before interest for diluted earnings per share $ (872,156) $ 310,181
Weighted average shares outstanding used in computing net income (loss) per share:    
 Basic 7,106,746 7,234,163
 Effect of dilutive stock options 490,194
 Diluted 7,106,746 7,724,357
 Net income (loss) per share applicable to common stockholders:    
 Basic $ (0.12) $ 0.04
 Diluted $ (0.12) $ 0.04