Accrued Liabilities (Details) - Accrued liabilities - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Accrued Liabilities (Details) - Accrued liabilities [Line Items]
Taxes payable	$ 1,179,000	$ 1,195,000
Interest payable	1,513,000	1,173,000
Warranty reserve	562,000	380,000
Deferred revenues	140,000	284,000
Compensation and employee benefits	311,000	225,000
Audit fees	134,000	134,000
Current portion of pension liability (see Note 15 – Pension Plan)		128,000
Other	440,000	768,000
Accrued Liabilities, Total	$ 4,279,000	$ 4,287,000