Earnings Per Share (Details) - USD ($)	3 Months Ended				6 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income	$ 608,577	$ 240,145	$ 438,105	$ 327,908	$ 848,722	$ 766,013
Denominator:
Basic weighted average shares	17,222,165		16,931,138		17,218,275	16,920,087
Dilutive effect of share-based awards	1,833		192,250		1,868	182,396
Diluted weighted average shares	17,223,998		17,123,388		17,220,143	17,102,483
Earnings per common share:
Basic EPS (in dollars per share)	$ 0.04		$ 0.03		$ 0.05	$ 0.05
Diluted EPS (in dollars per share)	$ 0.04		$ 0.03		$ 0.05	$ 0.04
Options to purchase common stock outstanding (in shares)	104,500		548,500		104,500	548,500
Diluted weighted-average shares outstanding excluded from computation of diluted EPS (in shares)	100,000		0		100,000	0