Contract Asset (Details) - USD ($)	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Contract Asset
Contract asset	$ 0				$ 80,182				$ 0	$ 80,182
Cumulative change in operating income resulting from changes in estimates	$ 1,217,487	$ 1,244,446	$ 51,763	$ 231,758	$ 873,033	$ 386,629	$ 173,067	$ 96,015	2,745,454	1,528,744	$ (3,711,539)
Long-term contracts accounted for under percentage-of-completion
Contract Asset
Cumulative change in operating income resulting from changes in estimates									$ 0	$ 16,000	$ 0