Condensed Consolidated Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 3,276	$ 3,949
Marketable securities	4,035	4,854
Trade accounts receivable, less allowances of $48 and $39, respectively	3,179	2,781
Inventories	2,429	2,219
Prepaid expenses and other current assets	804	350
Total current assets	13,723	14,153
Machinery and equipment	6,055	6,036
Leasehold improvements	332	332
Furniture and fixtures	400	400
	6,787	6,768
Less-accumulated depreciation and amortization	(6,500)	(6,434)
Total property and equipment, net	287	334
Capitalized software, net	127	175
Other assets	522	516
Total assets	14,659	15,178
LIABILITIES AND SHAREHOLDERS’ EQUITY
Accounts payable	1,441	777
Deferred revenue	761	375
Accrued liabilities	1,471	1,149
Accrued compensation	303	221
Total current liabilities	3,976	2,522
Deferred lease obligations	60	103
Long-term debt	3,500	3,500
Total liabilities	7,536	6,125
Commitments and Contingencies
Shareholders’ Equity
Common stock, $0.10 par value; 100,000,000 shares authorized; 6,996,146 and 7,006,310 shares issued and outstanding, respectively	700	701
Additional paid in capital	46,102	45,730
Retained deficit	(38,798)	(36,493)
Cumulative other comprehensive loss	(881)	(885)
Total shareholders' equity	7,123	9,053
Total liabilities and shareholders' equity	$ 14,659	$ 15,178