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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 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Numerator:            
Net income (loss) $ (512,816) $ (993,420) $ 103,959 $ 341,933 $ (1,506,236) $ 445,892
Net income (loss) allocated to restricted stock award (66,541)   10,521   (189,740) 43,773
Adjusted net income (loss) before interest for diluted earnings per share (446,275)   93,438   (1,316,496) 402,119
Convertible note interest    
Denominator: Weighted average shares outstanding used in computing net income (loss) per share:            
Basic 7,163,608   7,219,646   7,135,149 7,225,641
Effect of dilutive stock options   423,669   462,339
Effect of convertible note weighted shares    
Diluted 7,163,608   7,643,315   7,135,149 7,687,980
Net income (loss) per share applicable to common stockholders:            
Basic $ (0.06)   $ 0.01   $ (0.18) $ 0.06
Diluted $ (0.06)   $ 0.01   $ (0.18) $ 0.05