CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 43,000	$ 535,000
Receivables, net	1,382,000	2,381,000
Inventories	1,542,000	2,182,000
Prepaids and other assets	327,000	807,000
Total current assets	3,294,000	5,905,000
Long-term assets:
Rental equipment, net	656,000	927,000
Property, plant and equipment, net	2,200,000	2,284,000
Right of use assets	858,000	1,141,000
Goodwill		744,000
Restricted cash		850,000
Other assets	47,000	403,000
Total long-term assets	3,761,000	6,349,000
TOTAL ASSETS	7,055,000	12,254,000
Current liabilities:
Accounts payable	1,640,000	945,000
Accrued liabilities	4,555,000	6,046,000
Current portion of long-term debt	2,546,000	1,572,000
Current lease liabilities	302,000	284,000
Customer deposits	524,000	123,000
Total current liabilities	9,567,000	8,970,000
Long-term liabilities:
Long-term debt, less current portion	269,000	650,000
Long-term lease liabilities	591,000	893,000
Deferred pension liability and other	3,677,000	3,485,000
Total long-term liabilities	4,537,000	5,028,000
Total liabilities	14,104,000	13,998,000
Stockholders' deficit:
Preferred Stock Series A - $20 stated value - 416,500 shares authorized; shares issued and outstanding: 0 in 2020 and 2019 and Preferred Stock Series B - $200 stated value - 51,000 shares authorized; shares issued and outstanding: 0 in 2020 and 2019
Common Stock - $0.001 par value - 30,000,000 shares authorized; shares issued: 13,474,116 in 2020 and 2019; shares outstanding: 13,446,276 in 2020 and 2019	13,000	13,000
Additional paid-in-capital	41,330,000	41,088,000
Accumulated deficit	(38,007,000)	(33,164,000)
Accumulated other comprehensive loss	(7,322,000)	(6,618,000)
Treasury stock - at cost - 27,840 common shares in 2020 and 2019	(3,063,000)	(3,063,000)
Total stockholders' deficit	(7,049,000)	(1,744,000)
TOTAL LIABILITIES AND STOCKHOLDERS' DEFICIT	7,055,000	12,254,000
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 2020 and 2019 and Preferred Stock Series B - $200 stated value - 51,000 shares authorized; shares issued and outstanding: 0 in 2020 and 2019
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 2020 and 2019 and Preferred Stock Series B - $200 stated value - 51,000 shares authorized; shares issued and outstanding: 0 in 2020 and 2019