Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 4,743	$ 8,334
Marketable securities	4,395	4,817
Accounts receivable, net of allowance for doubtful accounts of $768 and $796, respectively	7,260	6,722
Inventories	4,856	4,485
Prepaid expenses and other current assets	3,699	1,797
Total current assets	24,953	26,155
Property and equipment:
Furniture and fixtures	489	461
Leasehold improvements	517	471
Equipment	4,462	4,427
Property and equipment, gross	5,468	5,359
Accumulated depreciation	3,845	3,484
Property and equipment, net	1,623	1,875
Deferred income taxes	4,017	4,017
Intangible assets, net	6,206	6,489
Other assets	300
TOTAL ASSETS	37,099	38,536
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	2,900	2,112
Accrued compensation	761	949
Warranty and other current liabilities	2,453	1,086
Total current liabilities	6,114	4,147
Deferred income taxes	259	241
Other long-term liabilities	158	168
Shareholders' equity:
Common stock, $.01 par value; 20,000,000 shares authorized, 4,967,373 and 4,966,619 outstanding, respectively	49	49
Additional paid-in capital	23,148	23,055
Accumulated other comprehensive income (loss)	84	390
Retained earnings	7,287	10,486
Total shareholders' equity	30,568	33,980
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 37,099	$ 38,536