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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 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Numerator:                
Net income (loss) $ (874,034) $ 103,959 $ 341,933 $ 643,626 $ 2,627,107 $ 202,902 $ (428,142) $ 3,473,635
Net income (loss) allocated to restricted stock award 92,388     (55,001)     42,794 (297,932)
Adjusted net income (loss) for basic earnings per share (781,646)     588,625     (385,348) 3,175,703
Convertible note interest     43,560     132,315
Adjusted net income (loss) before interest for diluted earnings per share $ (781,646)     $ 632,185     $ (385,348) $ 3,308,018
Denominator: Weighted average shares outstanding used in computing net income (loss) per share:                
Basic 7,153,210     7,162,924     7,202,239 6,927,837
Effect of dilutive stock options     817,556     1,045,654
Effect of convertible note weighted shares     958,904     958,904
Diluted 7,153,210     8,939,384     7,202,239 8,932,395
Net income (loss) per share applicable to common stockholders:                
Basic $ (0.11)     $ 0.08     $ (0.05) $ 0.46
Diluted $ (0.11)     $ 0.07     $ (0.05) $ 0.37