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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, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Numerator:            
Net income $ 103,959 $ 341,933 $ 2,627,107 $ 202,902 $ 445,892 $ 2,830,009
Net income allocated to restricted stock award 10,521   226,630   43,773 243,205
Adjusted net income for basic earnings per share 93,438   2,400,477   402,119 2,586,804
Convertible note interest   43,177   88,755
Adjusted net income before interest for diluted earnings per share $ 93,438   $ 2,443,654   $ 402,119 $ 2,675,559
Denominator: Weighted average shares outstanding used in computing net income per share:            
Basic 7,219,646   7,128,768   7,225,641 6,808,339
Effect of dilutive stock options 423,669   819,680   462,339 826,387
Effect of convertible note weighted shares   958,904   958,904
Diluted 7,643,315   8,907,352   7,687,980 8,593,630
Net income per share applicable to common stockholders:            
Basic $ 0.01   $ 0.34   $ 0.06 $ 0.38
Diluted $ 0.01   $ 0.27   $ 0.05 $ 0.31