Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 3,949	$ 7,470
Marketable securities	4,854	4,355
Trade accounts receivable, less allowances of $39 and $43, respectively	2,781	2,998
Inventories	2,219	1,556
Prepaid expenses and other current assets	350	414
Total current assets	14,153	16,793
Machinery and equipment	6,036	6,233
Leasehold improvements	332	327
Furniture and fixtures	400	400
	6,768	6,960
Less-accumulated depreciation and amortization	(6,434)	(6,591)
Total property and equipment, net	334	369
Capitalized software, net	175	225
Other assets	516	431
Total assets	15,178	17,818
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	777	1,008
Deferred revenue	375	164
Accrued liabilities	1,149	1,231
Accrued compensation	221	393
Total current liabilities	2,522	2,796
Deferred lease obligations	103	180
Long term debt	3,500	3,500
Total liabilities	6,125	6,476
Commitments and contingencies
Shareholders' Equity
Common stock, $.10 par value; 100,000,000 shares authorized; 7,006,310 and 6,895,085 shares issued and outstanding, respectively	701	690
Additional paid in capital	45,730	44,232
Retained deficit	(36,493)	(32,708)
Cumulative other comprehensive loss	(885)	(872)
Total shareholders' equity	9,053	11,342
Total liabilities and shareholders' equity	$ 15,178	$ 17,818