Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities:
Net income (loss)	$ 6,340,000	$ 7,174,000	$ (1,438,000)
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation	8,880,000	7,051,000	6,800,000
Amortization of intangible assets	299,000	441,000	559,000
Amortization of debt discount and prepaid debt costs	60,000	57,000	55,000
Gain on embedded derivatives	0	0	(1,086,000)
Pension (benefit) cost	20,000	437,000	(109,000)
Stock-based compensation expense	3,980,000	3,088,000	2,582,000
Provision for (recovery of) losses on accounts receivable	(35,000)	(245,000)	300,000
Inventory Write-down	1,622,000	(1,335,000)	583,000
Changes in operating assets and liabilities:
Trade and other accounts receivable	3,729,000	(4,914,000)	(827,000)
Inventories	(4,568,000)	(6,955,000)	(14,706,000)
Prepaid expenses and other assets	129,000	333,000	122,000
Deferred income taxes	994,000	550,000	(1,108,000)
Accounts payable and accrued liabilities	(2,559,000)	(8,500,000)	8,466,000
Increase (Decrease) in Deferred Revenue	(5,365,000)	5,378,000	0
Accrued employee compensation	4,018,000	(1,699,000)	278,000
Other long-term liabilities	2,347,000	(2,007,000)	(5,572,000)
Net cash provided by (used in) operating activities	19,891,000	(1,146,000)	(5,101,000)
Investing activities:
Purchases of property and equipment	(16,850,000)	(15,200,000)	(14,466,000)
Net cash used in investing activities	(16,850,000)	(15,200,000)	(14,466,000)
Financing activities:
Principal payments on long-term debt and short-term borrowings	(10,430,000)	(9,638,000)	(12,462,000)
Proceeds from long-term and short-term borrowings	8,709,000	13,481,000	12,229,000
Repurchase of shares for employee tax withholding obligation	(47,000)	(319,000)	(154,000)
Proceeds from issuance of common stock under equity compensation plans	412,000	1,762,000	2,819,000
Proceeds from issuance of common stock under secondary security offering	0	10,283,000	0
Release of restricted cash	0	0	8,000,000
Net cash provided by (used in) financing activities	(1,356,000)	15,569,000	10,432,000
Increase (decrease) in cash and cash equivalents from operations	1,685,000	(777,000)	(9,135,000)
Effect of exchange rate changes on cash and cash equivalents	223,000	227,000	(1,405,000)
Increase (decrease) in cash and cash equivalents	1,908,000	(550,000)	(10,540,000)
Cash and cash equivalents, beginning of period	28,739,000	29,289,000	39,829,000
Cash and cash equivalents, end of period	30,647,000	28,739,000	29,289,000
Cash paid for:
Interest	190,000	174,000	166,000
Income taxes	1,950,000	1,594,000	3,329,000
Supplemental schedule of noncash investing and financing activities:
Conversion of debenture into shares of common stock	$ 0	$ 0	$ 9,341,000