Nature of Business and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)		3 Months Ended		12 Months Ended
	Jul. 01, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020
Significant Accounting Policies [Line Items]
Carrying amount of long-term debt, including current portion		$ 3,470,000		$ 2,110,000
Short-term time deposits		460,000		$ 460,000
Intangible assets amortization expense		106,000	$ 66,000
Estimated amortization expense- 2021		425,000
Estimated amortization expense- 2022		390,000
Estimated amortization expense - 2023		362,000
Estimated amortization expense - 2024		336,000
Estimated amortization expense - 2025		$ 315,000
Weighted average remaining amortization period for acquired intangible assets		17 years 4 months 24 days		17 years 6 months
Research and development costs		$ 1,889,000	$ 1,749,000
Antidilutive options outstanding excluded from diluted EPS computations		40,000	0
Stock-based compensation expense		$ 104,000	$ 17,000
Foreign Currency Transaction Gain (Loss), before Tax		$ 0	$ 0
Stock-based compensation costs, effect on EPS		$ 0.01	$ 0.00
Number of Operating Segments		1
Cost of Goods and Services Sold		$ 12,481,000	$ 14,767,000
Operating Lease, Liability	$ 7,700,000
Operating Lease, Right-of-Use Asset	$ 7,700,000	7,390,000		$ 7,395,000
Package of practical expedients	true
Selling, General and Administrative Expenses [Member]
Significant Accounting Policies [Line Items]
Advertising and promotion costs		343,000	514,000
Sales revenue, net [Member] | Shipping and Handling [Member]
Significant Accounting Policies [Line Items]
Cost of Goods and Services Sold		221,000	260,000
Cost of sales [Member]
Significant Accounting Policies [Line Items]
Research and development costs		1,889,000	1,749,000
Cost of sales [Member] | Shipping and Handling [Member]
Significant Accounting Policies [Line Items]
Cost of Goods and Services Sold		106,000	$ 112,000
Allowance for doubtful accounts current
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance		$ 326,000		$ 326,000
Trade name
Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life		20 years
Impairment of intangible asset		$ 1,852,000