Debt - Narrative (Details)			1 Months Ended		3 Months Ended	12 Months Ended
	Feb. 19, 2021 USD ($)	Feb. 18, 2021	Sep. 30, 2022 USD ($) lender	Oct. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) customer lender	Sep. 30, 2021 USD ($) lender	Mar. 23, 2022 USD ($)	Mar. 22, 2022 USD ($)	Apr. 10, 2020 USD ($)	Dec. 17, 2018 USD ($)	Aug. 08, 2018 USD ($)
Line of Credit Facility [Line Items]
Number of customer invoices factored | customer						1
Revolving credit agreement
Line of Credit Facility [Line Items]
Percentage of stock pledged on credit agreement	66.67%
Notes Payable to Banks
Line of Credit Facility [Line Items]
Weighted average interest rate, revolving credit facility			2.70%			2.70%
Debt face amount			$ 1,465,000			$ 1,465,000
Long-term loan repayment schedule period			72 months			72 months
Notes Payable to Banks | Minimum
Line of Credit Facility [Line Items]
Debt instrument, term						6 months
Notes Payable to Banks | Maximum
Line of Credit Facility [Line Items]
Debt instrument, term						12 months
Notes Payable to Banks | Euro Interbank Offered Rate (Euribor)
Line of Credit Facility [Line Items]
Basis spread on LIBOR						3.20%
Foreign subsidiary borrowings
Line of Credit Facility [Line Items]
Receivables pledged as collateral			$ 792,000			$ 792,000	$ 485,000
Long-term debt			$ 7,101,000			$ 7,101,000	$ 6,632,000
Foreign subsidiary borrowings | Euro Interbank Offered Rate (Euribor) | Minimum
Line of Credit Facility [Line Items]
Euribor variable interest rates			1.50%			1.50%
Foreign subsidiary borrowings | Euro Interbank Offered Rate (Euribor) | Maximum
Line of Credit Facility [Line Items]
Euribor variable interest rates			5.10%			5.10%
Credit Agreement | Revolving credit agreement
Line of Credit Facility [Line Items]
Fixed charge coverage ratio			1.1			1.1
Percent availability under revolving commitment		12.50%				10.00%	10.00%
Debt instrument, covenant combined commitment percentage			10.00%			10.00%
Debt instrument, covenant combined borrowing base, percentage			10.00%			10.00%
Debt instrument, covenant combined borrowing base, amount			$ 2,000			$ 2,000
Receivables pledged as collateral			22,711,000			22,711,000	$ 25,370,000
Credit Agreement | Revolving credit agreement | Revolving credit agreement
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 28,000		35,000			35,000	35,000
Accordion feature, increase limit	10,000
Capital expenditures								$ 1,500,000
Letter of credit sub limit								$ 3,000,000	$ 2,000,000
Remaining borrowing capacity			9,403,000			9,403,000	14,570,000
Letters of credit			$ 1,970,000			$ 1,970,000	$ 1,800,000
Weighted average interest rate, revolving credit facility			4.86%			4.86%
Commitment fee percentage						0.25%	0.25%
Credit Agreement | Revolving credit agreement | Revolving credit agreement | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Basis spread on LIBOR						2.25%
Export Credit Facility | Revolving credit agreement | Revolving credit agreement
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity	7,000										$ 5,000
Weighted average interest rate, revolving credit facility			4.36%			4.36%	1.30%
Export Credit Facility | Revolving credit agreement | Revolving credit agreement | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Basis spread on LIBOR							1.25%
Export Credit Facility | Revolving credit agreement | Revolving credit agreement | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Basis spread on LIBOR						1.75%
Fifth Amendment to Credit Agreement and First Amendment to Export Credit Agreement | Revolving credit agreement | Revolving credit agreement
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 35,000
2018 Credit Agreement | Revolving credit agreement | Revolving credit agreement
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity												$ 30,000
Weighted average interest rate, revolving credit facility							1.84%
Debt instrument, unamortized discount premium			$ 86,000			$ 86,000
Revolving line of credit, accumulated amortization of debt issuance costs			$ 46,000			$ 46,000	$ 17,000
2018 Credit Agreement | Revolving credit agreement | Revolving credit agreement | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Basis spread on LIBOR							1.75%
First Loan
Line of Credit Facility [Line Items]
Debt face amount				$ 1,200,000	$ 717,000
Debt instrument, term				6 years	7 years
Debt instrument, number of lenders | lender			2			2	2
Debt instrument, decrease, forgiveness					$ 287,000
Second Loan
Line of Credit Facility [Line Items]
Debt face amount			$ 1,100,000		$ 303,000	$ 1,100,000
Debt instrument, term			5 years		5 years
Paycheck Protection Program Loan | Unsecured Debt
Line of Credit Facility [Line Items]
Debt face amount										$ 5,025,000
Paycheck Protection Program Loan | Unsecured Debt | JPMORGAN CHASE BANK N.A.
Line of Credit Facility [Line Items]
Long-term debt			$ 0			$ 0	$ 4,764,000