Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 5,473	$ 7,340
Marketable securities	11,807	11,438
Accounts receivable, less allowance for doubtful accounts of $745 at March 31, 2013 and $775 at December 31, 2012	6,248	6,129
Inventories	12,190	12,533
Income tax refunds receivable	811	1,325
Other current assets	1,558	1,338
Deferred tax assets	100	100
Total current assets	38,187	40,203
Marketable securities, long-term	10,165	10,435
Equipment and leasehold improvements, net	1,499	1,719
Intangible and other assets, net	174	189
Goodwill	569	569
Other assets	141	142
Deferred tax assets	349	363
Total assets	51,084	53,620
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	2,231	2,476
Advance customer payments	638	563
Accrued expenses	1,894	1,840
Deferred tax liability	29	29
Total current liabilities	4,792	4,908
Deferred rent	377	408
Deferred warranty revenue	180	146
Reserve for income taxes	688	686
Total liabilities	6,037	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, 6,947,299 shares issued and outstanding at March 31, 2013 and 6,969,772 shares issued and outstanding at December 31, 2012	31,326	31,410
Accumulated other comprehensive loss	(352)	(157)
Retained earnings	14,073	16,219
Total stockholders' equity	45,047	47,472
Total liabilities and stockholders' equity	$ 51,084	$ 53,620