Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities
Net income	$ 538us-gaap_NetIncomeLoss	$ 475us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided (used in) by operating activities:
Inventories reserve	25us-gaap_InventoryWriteDown	0us-gaap_InventoryWriteDown
Deferred tax expense	205us-gaap_DeferredIncomeTaxExpenseBenefit	126us-gaap_DeferredIncomeTaxExpenseBenefit
Depreciation and amortization	218us-gaap_DepreciationAndAmortization	297us-gaap_DepreciationAndAmortization
Share-based compensation expense	7us-gaap_ShareBasedCompensation	12us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities:
Accounts receivable	(2,481)	(2,695)
Inventories	537us-gaap_IncreaseDecreaseInInventories	710us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	241	368
Other assets	14	10
Accounts payable	103	740
Accrued compensation and related taxes	39	143
Accrued warranty expense	30RWC_AccuredWarrantyExpense	21RWC_AccuredWarrantyExpense
Deferred revenue	(19)	(26)
Accrued other expenses and other current liabilities	(74)	(45)
Net cash (used in) provided by operating activities	(617)	136
Investing activities
Purchases of property, plant and equipment	(102)	(137)
Net cash used in investing activities	(102)	(137)
Financing activities
Proceeds from issuance of common stock	41	98
Cash provided by financing activities	41	98
Net change in cash and cash equivalents	(678)	97
Cash and cash equivalents, beginning of period	11,363	7,945
Cash and cash equivalents, end of period	10,685	8,042
Supplemental disclosure
Cash paid for interest	0us-gaap_InterestPaid	0us-gaap_InterestPaid
Income tax paid	0us-gaap_IncomeTaxesPaid	0us-gaap_IncomeTaxesPaid
Non-cash financing activity
Cashless exercise of stock options and related conversion of net shares to stockholders' equity	$ 6	$ 1

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