Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Operating activities
Net income	$ 1,623us-gaap_NetIncomeLoss	$ 1,142us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Allowance for doubtful accounts	(35)us-gaap_ProvisionForDoubtfulAccounts	45us-gaap_ProvisionForDoubtfulAccounts
Inventory reserve	9us-gaap_InventoryWriteDown	128us-gaap_InventoryWriteDown
Deferred tax expense	875us-gaap_DeferredIncomeTaxExpenseBenefit	500us-gaap_DeferredIncomeTaxExpenseBenefit
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Share-based compensation expense	46us-gaap_ShareBasedCompensation	42us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities:
Accounts receivable	(387)	(827)
Inventories	(546)us-gaap_IncreaseDecreaseInInventories	1,642us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	(1)	(1,006)
Other assets	52	22
Accounts payable	453	(182)
Accrued compensation and related taxes	467	(706)
Accrued warranty expense	92RWC_AccuredWarrantyExpense	25RWC_AccuredWarrantyExpense
Deferred revenue	75	(280)
Note payable	0	(18)
Accrued other expenses and other current liabilities	63	(12)
Net cash provided by operating activities	3,971	1,990
Investing activities
Purchases of property, plant and equipment	(697)	(338)
Capitalized software	0	(340)
Net cash used in investing activities	(697)	(678)
Financing activities
Proceeds from issuance of common stock	144	52
Net cash provided by financing activities	144	52
Increase in cash	3,418	1,364
Cash and cash equivalents, beginning of year	7,945	6,581
Cash and cash equivalents, end of year	11,363	7,945
Supplemental disclosure
Cash paid for interest	0us-gaap_InterestPaid	0us-gaap_InterestPaid
Cash paid for income taxes	0us-gaap_IncomeTaxesPaid	0us-gaap_IncomeTaxesPaid
Non-cash financing activity
Cashless exercise of stock options	$ 2	$ 9

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