Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 4,622	$ 7,340
Marketable securities	10,633	11,438
Accounts receivable, less allowance for doubtful accounts of $735 at June 30, 2013 and $775 at December 31, 2012	7,930	6,129
Inventories	11,763	12,533
Income tax refunds receivable	811	1,325
Other current assets	1,385	1,338
Deferred tax assets	100	100
Total current assets	37,244	40,203
Marketable securities, long-term	10,032	10,435
Equipment and leasehold improvements, net	1,562	1,719
Intangible and other assets, net	149	189
Goodwill	569	569
Other assets	284	142
Deferred tax assets	329	363
Total assets	50,169	53,620
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	3,605	2,476
Advance customer payments	307	563
Accrued expenses	1,861	1,840
Deferred tax liability	29	29
Total current liabilities	5,802	4,908
Deferred rent	413	408
Deferred warranty revenue	175	146
Reserve for income taxes	687	686
Total liabilities	7,077	6,148
Commitments and contingencies
Stockholders' equity:
Preferred stock, no par value, 5,000,000 shares authorized, none outstanding
Common stock, no par value, 25,000,000 shares authorized, 6,866,674 shares issued and outstanding at June 30, 2013 and 6,969,772 shares issued and outstanding at December 31, 2012	30,943	31,410
Accumulated other comprehensive loss	(724)	(157)
Retained earnings	12,873	16,219
Total stockholders' equity	43,092	47,472
Total liabilities and stockholders' equity	$ 50,169	$ 53,620