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Earnings Per Share (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2022
Mar. 31, 2021
Numerator:            
Net income $ 1,429,570 $ 1,133,058 $ 608,577 $ 240,145 $ 2,562,628 $ 848,722
Denominator:            
Basic weighted average shares 17,253,746   17,222,165   17,250,059 17,218,275
Dilutive effect of share-based awards     1,833     1,868
Diluted weighted average shares 17,253,746   17,223,998   17,250,059 17,220,143
Earnings per common share:            
Basic EPS (in dollars per share) $ 0.08   $ 0.04   $ 0.15 $ 0.05
Diluted EPS (in dollars per share) $ 0.08   $ 0.04   $ 0.15 $ 0.05
Options to purchase common stock outstanding (in shares) 100,000   104,500   100,000 104,500
Diluted weighted-average shares outstanding excluded from computation of diluted EPS (in shares) 100,000   100,000   100,000 100,000