Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES
Net loss	$ (178)us-gaap_NetIncomeLoss	$ (809)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	202us-gaap_Depreciation	211us-gaap_Depreciation
Amortization of finite-lived intangible assets	26us-gaap_AmortizationOfIntangibleAssets	24us-gaap_AmortizationOfIntangibleAssets
Stock-based compensation	13us-gaap_ShareBasedCompensation	90us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable, net	114	(534)
Decrease in inventories, net	168us-gaap_IncreaseDecreaseInInventories	342us-gaap_IncreaseDecreaseInInventories
(Increase) decrease in other assets	(36)	90
(Decrease) increase in trade accounts payable, accrued compensation and commissions expense, accrued warranty expense and other accrued liabilities	(197)	46
Net cash provided by (used in) operating activities	112	(540)
INVESTING ACTIVITIES
Capital expenditures	(256)	(12)
Asset acquisition	0	(748)
Net cash used in investing activities	(256)	(760)
FINANCING ACTIVITIES
Net borrowing on note payable to bank	0us-gaap_RepaymentsOfNotesPayable	214us-gaap_RepaymentsOfNotesPayable
Net cash provided by (used in) financing activities	0	214
Decrease in cash and cash equivalents	(144)	(1,086)
Cash and cash equivalents at beginning of period	5,192	7,183
Cash and cash equivalents at end of period	5,048	6,097
Supplemental Disclosure:
Cash paid for interest	0us-gaap_IncomeTaxesPaid	10us-gaap_IncomeTaxesPaid
Cash paid for income taxes	$ 5us-gaap_InterestPaid	$ 7us-gaap_InterestPaid

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.