Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 5,734	$ 5,224
Marketable securities	2,811	2,093
Accounts receivable, net of allowance for doubtful accounts of $591 and $677, respectively	7,976	10,148
Inventories	5,517	6,142
Prepaid expenses and other receivables	1,624	1,644
Deferred income taxes	429	429
Total current assets	24,091	25,680
Property and equipment:
Furniture and fixtures	449	444
Leasehold improvements	442	363
Equipment	3,554	3,364
Property and equipment, gross	4,445	4,171
Accumulated depreciation	2,871	2,736
Property and equipment, net	1,574	1,435
Deferred income taxes	3,156	3,131
Intangible assets	7,674	7,888
Goodwill	3,215	3,120
TOTAL ASSETS	39,710	41,254
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	746	1,998
Accrued compensation	877	1,013
Accrued warranty and accrued liabilities	1,461	1,534
Income taxes payable	30	67
Total current liabilities	3,114	4,612
Income taxes payable	316	316
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, 4,912,619 and 4,910,619 issued and outstanding, respectively	49	49
Additional paid-in capital	22,720	22,619
Accumulated other comprehensive income (loss)	341	(180)
Retained earnings	13,170	13,838
Total shareholders' equity	36,280	36,326
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 39,710	$ 41,254