Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 10,685	$ 11,363
Trade accounts receivable (net of allowance for doubtful accounts of $49 at March 31, 2015 and December 31, 2014, respectively)	5,747	3,266
Inventories, net	11,550	12,112
Deferred tax assets	3,468	3,743
Prepaid expenses and other current assets	1,680	1,921
Total current assets	33,130	32,405
Property, plant and equipment, net	1,269	1,282
Deferred tax assets, net	2,360	2,290
Capitalized software, net	650	753
Other assets	242	256
Total assets	37,651	36,986
Current liabilities:
Accounts payable	1,506	1,403
Accrued compensation and related taxes	1,285	1,246
Accrued warranty expense	414	384
Accrued other expenses and other current liabilities	143	217
Deferred revenue	128	291
Total current liabilities	3,476	3,541
Deferred revenue	356	212
Total liabilities	3,832	3,753
Stockholders' equity:
Preferred stock; $1.00 par value; 1,000,000 authorized shares none issued or outstanding.	0	0
Common stock; $.60 par value; 20,000,000 authorized shares: 13,690,760 and 13,665,087 issued and outstanding shares at March 31, 2015 and December 31, 2014, respectively	8,214	8,199
Additional paid-in capital	24,849	24,816
Retained earnings	756	218
Total stockholders' equity	33,819	33,233
Total liabilities and stockholders' equity	$ 37,651	$ 36,986