CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 580,000	$ 535,000
Receivables, net	1,920,000	2,381,000
Inventories	2,260,000	2,182,000
Prepaids and other assets	614,000	807,000
Total current assets	5,374,000	5,905,000
Long-term assets:
Rental equipment, net	862,000	927,000
Property, plant and equipment, net	2,375,000	2,284,000
Right of use assets	1,062,000	1,141,000
Goodwill	744,000	744,000
Restricted cash	850,000	850,000
Other assets	403,000	403,000
Total long-term assets	6,296,000	6,349,000
TOTAL ASSETS	11,670,000	12,254,000
Current liabilities:
Accounts payable	1,320,000	945,000
Accrued liabilities	5,755,000	6,046,000
Current portion of long-term debt	2,335,000	1,572,000
Current lease liabilities	279,000	284,000
Customer deposits	124,000	123,000
Total current liabilities	9,813,000	8,970,000
Long-term liabilities:
Long-term debt, less current portion	650,000	650,000
Long-term lease liabilities	820,000	893,000
Deferred pension liability and other	3,365,000	3,485,000
Total long-term liabilities	4,835,000	5,028,000
Total liabilities	14,648,000	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	41,088,000	41,088,000
Accumulated deficit	(34,207,000)	(33,164,000)
Accumulated other comprehensive loss	(6,809,000)	(6,618,000)
Treasury stock - at cost - 27,840 common shares in 2020 and 2019	(3,063,000)	(3,063,000)
Total stockholders' deficit	(2,978,000)	(1,744,000)
TOTAL LIABILITIES AND STOCKHOLDERS' DEFICIT	11,670,000	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