Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net (loss) income	$ (804)	$ 125
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	425	111
Amortization of bond premium	17
Inventory reserve	16
Stock-based compensation	1,078	1,400
Gain on sale of asset	(9)
Changes in operating assets and liabilities:
Accounts receivable	292	(1,258)
Inventories	(355)	396
Prepaid expenses and other current assets	(88)	41
Accounts payable, accrued expenses, and other current liabilities	(322)	(428)
Net cash provided by operating activities	250	387
Cash flows from investing activities:
Purchase of equipment	(552)	(1,042)
Proceeds from sale of asset	15
Maturities of investments	7,250	4,000
Purchase of investments	(7,000)	(6,549)
Net cash used in investing activities	(287)	(3,591)
Cash flows from financing activities:
Proceeds from exercise of stock options	257	42
Purchase of treasury stock		(368)
Net cash provided by (used in) financing activities	257	(326)
Net increase (decrease) in cash and cash equivalents	220	(3,530)
Cash and cash equivalents, beginning of period	4,385	7,571
Cash and cash equivalents, end of period	4,605	4,041
Cash paid for interest, net of amount capitalized of $13 thousand in 2012	3
Cash paid for taxes	$ 20