Debt and Subsequent Event - Narrative (Details)		3 Months Ended	12 Months Ended
	Feb. 06, 2023	Dec. 31, 2022 USD ($) lender customer	Sep. 30, 2022 USD ($)	Apr. 28, 2023 USD ($)	Mar. 23, 2022 USD ($)	Mar. 22, 2022 USD ($)	Apr. 10, 2020 USD ($)
Line of Credit Facility [Line Items]
Number of customer invoices factored | customer		1
Foreign subsidiary borrowings
Line of Credit Facility [Line Items]
Receivables pledged as collateral		$ 402,000	$ 792,000
Remaining debt balance		$ 7,579,000	7,101,000
Foreign subsidiary borrowings | Euribor | Minimum
Line of Credit Facility [Line Items]
Euribor variable interest rates		0.50%
Foreign subsidiary borrowings | Euribor | Maximum
Line of Credit Facility [Line Items]
Euribor variable interest rates		5.60%
First Loan
Line of Credit Facility [Line Items]
Debt instrument, number of lenders | lender		1
Face amount		$ 1,141,000
Debt instrument, term		6 years
Quarterly payment		$ 56,000
Revolving credit agreement | Credit Agreement | Revolving credit agreement
Line of Credit Facility [Line Items]
Receivables pledged as collateral		21,646,000	22,711,000
Revolving credit facility, maximum borrowing capacity		35,000,000	35,000,000
Remaining borrowing capacity		$ 8,130,000	$ 9,403,000
Percent availability under revolving commitment		10.00%	10.00%
Letters of credit outstanding, amount		$ 1,970,000	$ 1,970,000
Line of credit facility, unfunded capital expenditures					$ 1,500,000
Line of credit facility, accordion feature, letter of credit sub limit					$ 3,000,000	$ 2,000,000
Weighted average interest rate, revolving credit facility		6.50%	4.90%
Commitment fee percentage		0.25%
Revolving credit agreement | Credit Agreement | Revolving credit agreement | Subsequent Event
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity				$ 2,000,000
FFCR	1.1
Revolving credit agreement | Credit Agreement | Revolving credit agreement | SOFR
Line of Credit Facility [Line Items]
Basis spread		2.25%
Revolving credit agreement | Credit Agreement | Revolving credit agreement | LIBOR
Line of Credit Facility [Line Items]
Basis spread			2.25%
Revolving credit agreement | Export Credit Facility | Revolving credit agreement
Line of Credit Facility [Line Items]
Weighted average interest rate, revolving credit facility		6.00%	4.40%
Revolving credit agreement | Export Credit Facility | Revolving credit agreement | SOFR
Line of Credit Facility [Line Items]
Basis spread		1.75%
Revolving credit agreement | Export Credit Facility | Revolving credit agreement | LIBOR
Line of Credit Facility [Line Items]
Basis spread			1.75%
Revolving credit agreement | 2018 Credit Agreement | Revolving credit agreement
Line of Credit Facility [Line Items]
Remaining unamortized amount		$ 86,000
Revolving line of credit, accumulated amortization of debt issuance costs		53,000	$ 46,000
Revolving credit agreement | Credit Agreement and Export Credit Facility | Revolving credit agreement | Subsequent Event
Line of Credit Facility [Line Items]
Aggregate outstanding principal balance				$ 19,000,000
Unsecured Promissory Note | PPP Loan
Line of Credit Facility [Line Items]
Face amount							$ 5,025,000
Unsecured Promissory Note | PPP Loan | JPMorgan Chase Bank, N.A.
Line of Credit Facility [Line Items]
Remaining debt balance		$ 0	$ 0