Income Taxes - Deferred tax assets and liabilities component (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2020
Deferred tax assets:
Reserves and accruals	$ 778,805	$ 651,321	$ 654,624
Research and development credit			1,327,162
NOL carryforwards -fed/state	980,755	984,004	1,612,043
Stock options	241,598	45,069	41,652
Amortization	520,445
Gross deferred tax assets	2,521,603	1,680,394	3,635,481
Less: Valuation allowance	(977,747)	(981,816)	(1,449,204)
Total deferred tax assets	1,543,856	698,578	2,186,277
Deferred tax liabilities:
Depreciation	(1,087,653)	(652,091)	(1,122,455)
Total deferred tax liabilities	(1,087,653)	(652,091)	(1,122,455)
Net deferred tax asset	$ 456,203	$ 46,487	$ 1,063,822