Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
OPERATING ACTIVITIES
Net loss	$ (711)	$ (2,825)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	804	821
Amortization of finite-lived intangible assets	66	101
Gain on disposal of assets	(67)	0
Impairment of note receivable	43	0
Stock-based compensation	265	308
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable, net	660	(29)
Decrease in inventories, net	625	523
Decrease in other assets	13	104
Decrease in trade accounts payable, accrued compensation and commissions expense, accrued warranty expense and other accrued liabilities	(1,009)	(302)
Net cash provided by (used in) operating activities	689	(1,299)
INVESTING ACTIVITIES
Capital expenditures	(422)	(263)
Asset acquisition	0	(748)
Proceeds from disposal of property, plant and equipment	94	0
Net cash used in investing activities	(328)	(1,011)
FINANCING ACTIVITIES
Net repayments on note payable to bank	0	(1,181)
Restricted cash	0	1,500
Net cash provided by financing activities	0	319
Increase (decrease) in cash and cash equivalents	361	(1,991)
Cash and cash equivalents at beginning of period	5,192	7,183
Cash and cash equivalents at end of period	5,553	5,192
Supplemental Disclosure:
Cash paid for interest	21	32
Cash paid for income taxes	$ 30	$ 0