CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 525	$ 747
Accounts receivable, net	3,668	3,522
Inventories	1,874	2,164
Prepaids and other assets	977	1,539
Total current assets	7,044	7,972
Long-term assets:
Rental equipment, net	1,840	2,016
Property, plant and equipment, net	2,347	2,286
Goodwill	744	744
Restricted cash	950	1,162
Other assets	808	804
Total long-term assets	6,689	7,012
TOTAL ASSETS	13,733	14,984
Current liabilities:
Accounts payable	2,532	2,778
Accrued liabilities	6,113	5,781
Current portion of long-term debt	2,874	3,529
Current portion of long-term debt - related party	500	500
Customer deposits	608	1,135
Total current liabilities	12,627	13,723
Long-term liabilities:
Long-term debt, less current portion	1,018	1,034
Long-term debt - related party, less current portion	500	500
Deferred pension liability and other	3,506	3,638
Total long-term liabilities	5,024	5,172
Total liabilities	17,651	18,895
Stockholders' deficit:
Preferred Stock Series A - $20 stated value - 416,500 shares authorized; shares issued and outstanding: 0 in 2018 and 2017 and Preferred Stock Series B - $200 stated value - 51,000 shares authorized; shares issued and outstanding: 16,512 in 2018 and 2017 (liquidation preference $3,393,000)	3,302	3,302
Common Stock - $0.001 par value - 10,000,000 shares authorized; shares issued: 2,190,011 in 2018 and 2017; shares outstanding: 2,162,171 in 2018 and 2017	2	2
Additional paid-in-capital	28,273	28,273
Accumulated deficit	(26,829)	(26,889)
Accumulated other comprehensive loss	(5,603)	(5,536)
Treasury stock - at cost - 27,840 common shares in 2018 and 2017	(3,063)	(3,063)
Total stockholders' deficit	(3,918)	(3,911)
TOTAL LIABILITIES AND STOCKHOLDERS' DEFICIT	13,733	14,984
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 2018 and 2017 and Preferred Stock Series B - $200 stated value - 51,000 shares authorized; shares issued and outstanding: 16,512 in 2018 and 2017 (liquidation preference $3,393,000)
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 2018 and 2017 and Preferred Stock Series B - $200 stated value - 51,000 shares authorized; shares issued and outstanding: 16,512 in 2018 and 2017 (liquidation preference $3,393,000)	$ 3,302	$ 3,302