Earnings Per Share (Details) - USD ($)	3 Months Ended				6 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net Income	$ 5,680,316	$ 4,006,936	$ 4,670,090	$ 2,434,162	$ 9,687,252	$ 7,104,252
Weighted average common shares (in shares)	8,122,157		8,032,218		8,101,887	8,017,820
Effect of dilutive securities:
Options to purchase common stock (in shares)	22,806		40,931		27,331	44,600
Diluted average common shares (in shares)	8,144,963		8,073,149		8,129,218	8,062,420
Earnings Per Share of Common Stock:
Basic (in dollars per share)	$ 0.70		$ 0.58		$ 1.20	$ 0.89
Diluted (in dollars per share)	$ 0.70		$ 0.58		$ 1.19	$ 0.88