Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 4,669	$ 11,363
Trade accounts receivable (net of allowance for doubtful accounts of $49 in 2015 and 2014, respectively)	4,122	3,266
Inventories, net	16,282	12,112
Prepaid expenses and other current assets	3,081	1,921
Total current assets	28,154	28,662
Property, plant and equipment, net	1,840	1,282
Available-for-sale securities	3,402	0
Deferred tax assets, net	5,461	6,033
Capitalized software, net	370	753
Other assets	222	256
Total assets	39,449	36,986
Current liabilities:
Accounts payable	2,285	1,403
Accrued compensation and related taxes	1,136	1,246
Accrued warranty expense	538	384
Accrued other expenses and other current liabilities	168	217
Deferred revenue	136	291
Total current liabilities	4,263	3,541
Deferred revenue	366	212
Total liabilities	4,629	$ 3,753
Commitments and contingencies
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: 13,730,562 and 13,665,087 issued and outstanding shares at December 31, 2015 and 2014, respectively	8,238	8,199
Additional paid-in capital	24,926	24,816
Accumulated other comprehensive income	397	0
Retained earnings	1,259	218
Total stockholders' equity	34,820	33,233
Total liabilities and stockholders' equity	$ 39,449	$ 36,986