Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 7,536	$ 8,334
Marketable securities	4,501	4,817
Accounts receivable, net of allowance for doubtful accounts of $768 and $796, respectively	5,298	6,722
Inventories	4,092	4,485
Prepaid expenses and other current assets	3,470	1,797
Total current assets	24,897	26,155
Property and equipment:
Furniture and fixtures	456	461
Leasehold improvements	504	471
Equipment	4,409	4,427
Property and equipment, gross	5,369	5,359
Accumulated depreciation	3,644	3,484
Property and equipment, net	1,725	1,875
Deferred income taxes	4,017	4,017
Intangible assets, net	6,243	6,489
Other assets	300
TOTAL ASSETS	37,182	38,536
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	2,518	2,112
Accrued compensation	899	949
Warranty and other current liabilities	1,194	1,086
Total current liabilities	4,611	4,147
Deferred income taxes	241	241
Other long-term liabilities	158	168
Shareholders' equity:
Preferred stock, $.01 par value; 5,000,000 shares authorized, none issued or outstanding
Common stock, $.01 par value; 20,000,000 shares authorized, 4,967,800 and 4,966,619 issued and outstanding, respectively	49	49
Additional paid-in capital	23,110	23,055
Accumulated other comprehensive income (loss)	(20)	390
Retained earnings	9,033	10,486
Total shareholders' equity	32,172	33,980
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 37,182	$ 38,536