CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 50,000	$ 48,000
Receivables, net	2,983,000	2,832,000
Inventories	2,214,000	2,722,000
Prepaids and other assets	1,050,000	1,071,000
Total current assets	6,297,000	6,673,000
Long-term assets:
Rental equipment, net	196,000	225,000
Property, plant and equipment, net	1,652,000	1,715,000
Right of use assets	660,000	765,000
Other assets	34,000	34,000
Total long-term assets	2,542,000	2,739,000
TOTAL ASSETS	8,839,000	9,412,000
Current liabilities:
Accounts payable	6,762,000	6,339,000
Accrued liabilities	4,336,000	4,279,000
Current portion of long-term debt	3,768,000	3,768,000
Current lease liabilities	313,000	393,000
Customer deposits	989,000	1,183,000
Total current liabilities	16,168,000	15,962,000
Long-term liabilities:
Long-term debt, less current portion	500,000	500,000
Long-term lease liabilities	383,000	412,000
Deferred pension liability and other	2,925,000	2,862,000
Total long-term liabilities	3,808,000	3,774,000
Total liabilities	19,976,000	19,736,000
Stockholders' deficit:
Preferred Stock Series A - $20 stated value - 416,500 shares authorized; shares issued and outstanding: 0 in 2022 and 2021 and Preferred Stock Series B - $200 stated value - 51,000 shares authorized;shares issued and outstanding: 0 in 2022 and 2021
Common Stock - $0.001 par value - 30,000,000 shares authorized; shares issued: 13,474,116 in 2022 and 2021; shares outstanding: 13,446,276 in 2022 and 2021	13,000	13,000
Additional paid-in-capital	41,482,000	41,444,000
Accumulated deficit	(43,510,000)	(42,652,000)
Accumulated other comprehensive loss	(6,059,000)	(6,066,000)
Treasury stock - at cost - 27,840 common shares in 2022 and 2021	(3,063,000)	(3,063,000)
Total stockholders' deficit	(11,137,000)	(10,324,000)
TOTAL LIABILITIES AND STOCKHOLDERS' DEFICIT	8,839,000	9,412,000
Convertible Preferred Stock [Member] | Series A Preferred Stock [Member]
Stockholders' deficit:
Preferred Stock Series A - $20 stated value - 416,500 shares authorized; shares issued and outstanding: 0 in 2022 and 2021 and Preferred Stock Series B - $200 stated value - 51,000 shares authorized;shares issued and outstanding: 0 in 2022 and 2021
Convertible Preferred Stock [Member] | Series B Preferred Stock [Member]
Stockholders' deficit:
Preferred Stock Series A - $20 stated value - 416,500 shares authorized; shares issued and outstanding: 0 in 2022 and 2021 and Preferred Stock Series B - $200 stated value - 51,000 shares authorized;shares issued and outstanding: 0 in 2022 and 2021