Restatement of Previously issued Financial Statements (Quarterly Consolidated Statement of Cash Flows) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
OPERATING ACTIVITIES:
Net income (loss)	$ (278,000)	$ (952,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	2,118,000	1,768,000
Amortization of intangible assets	91,000	134,000
Amortization of debt discount and prepaid debt costs	15,000	11,000
Pension cost	5,000	46,000
Stock-based compensation expense	957,000	1,286,000
Recovery of losses on accounts receivable	10,000	(172,000)
Changes in operating assets and liabilities:
Trade and other accounts receivable	152,000	(4,033,000)
Inventories	(880,000)	(5,782,000)
Prepaid expenses and other assets	77,000	116,000
Accounts payable and accrued liabilities and deferred revenue	5,624,000	(1,444,000)
Accrued employee compensation	1,116,000	(533,000)
Deferred income taxes	(8,000)	11,000
Other long-term liabilities	(33,000)	(2,263,000)
Net cash used in operating activities	8,966,000	(11,807,000)
INVESTING ACTIVITIES:
Purchases of property and equipment	(2,026,000)	(4,057,000)
Net cash used in investing activities	(2,026,000)	(4,057,000)
FINANCING ACTIVITIES:
Principal payments on long-term debt and short-term borrowings	(3,608,000)	(3,183,000)
Proceeds from long-term and short-term borrowings	3,318,000	8,161,000
Proceeds from sale of common stock, net of offering costs	0	10,283,000
Repurchase of shares	(20,000)	(286,000)
Proceeds from issuance of common stock under equity compensation plans	281,000	1,319,000
Net cash provided by financing activities	(29,000)	16,294,000
Increase in cash and cash equivalents from operations	6,911,000	430,000
Effect of exchange rate changes on cash and cash equivalents	(1,526,000)	909,000
Increase in cash and cash equivalents	5,385,000	1,339,000
Cash and cash equivalents, at carrying value	34,124,000	30,628,000
Scenario, Previously Reported [Member]
OPERATING ACTIVITIES:
Net income (loss)		504,000
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation		1,768,000
Amortization of intangible assets		134,000
Amortization of debt discount and prepaid debt costs		11,000
Pension cost		46,000
Stock-based compensation expense		1,286,000
Recovery of losses on accounts receivable		(103,000)
Changes in operating assets and liabilities:
Trade and other accounts receivable		(6,568,000)
Inventories		(3,211,000)
Prepaid expenses and other assets		229,000
Accounts payable and accrued liabilities and deferred revenue		(3,217,000)
Accrued employee compensation		(434,000)
Deferred income taxes		11,000
Other long-term liabilities		(2,263,000)
Net cash used in operating activities		(11,807,000)
INVESTING ACTIVITIES:
Purchases of property and equipment		(4,057,000)
Net cash used in investing activities		(4,057,000)
FINANCING ACTIVITIES:
Principal payments on long-term debt and short-term borrowings		(3,183,000)
Proceeds from long-term and short-term borrowings		8,161,000
Proceeds from sale of common stock, net of offering costs		10,283,000
Repurchase of shares		(286,000)
Proceeds from issuance of common stock under equity compensation plans		1,319,000
Net cash provided by financing activities		16,294,000
Increase in cash and cash equivalents from operations		430,000
Effect of exchange rate changes on cash and cash equivalents		909,000
Increase in cash and cash equivalents		1,339,000
Cash and cash equivalents, at carrying value		30,628,000
Restatement Adjustment [Member]
OPERATING ACTIVITIES:
Net income (loss)		(1,456,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation		0
Amortization of intangible assets		0
Amortization of debt discount and prepaid debt costs		0
Pension cost		0
Stock-based compensation expense		0
Recovery of losses on accounts receivable		(69,000)
Changes in operating assets and liabilities:
Trade and other accounts receivable		2,535,000
Inventories		(2,571,000)
Prepaid expenses and other assets		(113,000)
Accounts payable and accrued liabilities and deferred revenue		1,773,000
Accrued employee compensation		(99,000)
Deferred income taxes		0
Other long-term liabilities		0
Net cash used in operating activities		0
INVESTING ACTIVITIES:
Purchases of property and equipment		0
Net cash used in investing activities		0
FINANCING ACTIVITIES:
Principal payments on long-term debt and short-term borrowings		0
Proceeds from long-term and short-term borrowings		0
Proceeds from sale of common stock, net of offering costs		0
Repurchase of shares		0
Proceeds from issuance of common stock under equity compensation plans		0
Net cash provided by financing activities		0
Increase in cash and cash equivalents from operations		0
Effect of exchange rate changes on cash and cash equivalents		0
Increase in cash and cash equivalents		0
Cash and cash equivalents, at carrying value		$ 0