Debt and Subsequent Event - Narrative (Details)		6 Months Ended	9 Months Ended		12 Months Ended
	Feb. 06, 2023	Jun. 30, 2023 USD ($)	Jun. 30, 2023 USD ($) customer	Jun. 30, 2022 USD ($) lender	Sep. 30, 2022 USD ($)	Aug. 09, 2023 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		$ 256,000	$ 256,000		$ 792,000
Remaining debt balance		$ 7,803,000	$ 7,803,000		7,101,000
Foreign subsidiary borrowings | Euribor | Minimum
Line of Credit Facility [Line Items]
Euribor variable interest rates		0.50%	0.50%
Foreign subsidiary borrowings | Euribor | Maximum
Line of Credit Facility [Line Items]
Euribor variable interest rates		7.60%	7.60%
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		19,567,000	$ 19,567,000		22,711,000
Revolving credit facility, maximum borrowing capacity		35,000,000	35,000,000		35,000,000
Remaining borrowing capacity		2,649,000	$ 2,649,000		$ 9,403,000
Percent availability under revolving commitment			10.00%		10.00%
Letters of credit outstanding, amount		$ 1,970,000	$ 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		7.50%	7.50%		4.90%
Commitment fee percentage			0.25%
FFCR	1.1
Reserves under borrowing base							$ 2,000,000
Revolving credit agreement | Credit Agreement | Revolving credit agreement | Subsequent Event
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity						$ 23,000,000
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		7.00%	7.00%		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 | Credit Agreement and Export Credit Facility | Revolving credit agreement
Line of Credit Facility [Line Items]
Aggregate outstanding principal balance							$ 19,000,000
Revolving credit agreement | Credit Agreement and Export Credit Facility | Revolving credit agreement | Subsequent Event
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity						30,000,000
Revolving credit agreement | Credit Agreement and Export Credit Facility | Revolving credit agreement | Subsequent Event | Through September 30, 2023
Line of Credit Facility [Line Items]
Reserves under borrowing base						1,500,000
Aggregate outstanding principal balance						18,000,000
Revolving credit agreement | Credit Agreement and Export Credit Facility | Revolving credit agreement | Subsequent Event | Thereafter
Line of Credit Facility [Line Items]
Reserves under borrowing base						2,000,000
Aggregate outstanding principal balance						$ 19,000,000
Revolving credit agreement | 2018 Credit Agreement | Revolving credit agreement
Line of Credit Facility [Line Items]
Remaining unamortized amount		$ 86,000	$ 86,000
Revolving line of credit, accumulated amortization of debt issuance costs		67,000	67,000		$ 46,000
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		$ 0