CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Cash flows related to operating activities:
Net (loss) income	$ (3,126)us-gaap_NetIncomeLoss	$ 975us-gaap_NetIncomeLoss
Adjustments to reconcile net (loss) income to net cash generated in operating activities:
Depreciation and amortization	652	640
Deferred income taxes (benefit)	(1,993)	41
Stock based compensation	361us-gaap_ShareBasedCompensation	255us-gaap_ShareBasedCompensation
Increase (decrease) in inventory reserve	540svt_IncreaseDecreaseInInventoryReserve	(64)svt_IncreaseDecreaseInInventoryReserve
Decrease in allowance for doubtful accounts	(56)	(8)
Gain on disposal of property and equipment		(22)
Change in assets and liabilities:
Accounts receivable	(976)	(124)
Inventories	(651)us-gaap_IncreaseDecreaseInInventories	(652)us-gaap_IncreaseDecreaseInInventories
Prepaid income taxes	310us-gaap_IncreaseDecreaseInPrepaidTaxes	98us-gaap_IncreaseDecreaseInPrepaidTaxes
Other assets	(139)	(5)
Other non-current assets	(38)
Accounts payable	129	165
Accrued employee compensation and benefit costs	173	279
Accrued arbitration award and related liability	5,597svt_ArbitrationAwardExpense
Other accrued liabilities	147	(92)
Accrued income taxes	31
Employee stock ownership trust payment	101	100
Net cash generated in operating activities	1,062	1,586
Cash flows related to investing activities:
Capital expenditures - property, plant and equipment	(3,154)	(1,563)
Proceeds from sale of assets		43
Net cash used in investing activities	(3,154)	(1,520)
Cash flows related to financing activities:
Principal payments on long-term debt	(2,662)us-gaap_RepaymentsOfLongTermDebt	(194)us-gaap_RepaymentsOfLongTermDebt
Acquisition of long term debt	4,620svt_AcquisitionOfLongTermDebt
Proceeds from exercise of stock options		70
Purchase of treasury shares	(202)	(607)
Cash dividend		(406)us-gaap_PaymentsOfDividends
Net cash generated (used) in financing activities	1,756	(1,137)
Net decrease in cash and cash equivalents	(336)	(1,071)
Cash and cash equivalents at beginning of period	4,502	5,573
Cash and cash equivalents at end of period	$ 4,166	$ 4,502

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