Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 8,325	$ 10,910
Trade accounts receivable, net	3,288	3,448
Inventories, net	14,751	13,999
Prepaid expenses and other current assets	1,042	1,410
Total current assets	27,406	29,767
Property, plant and equipment, net	2,506	2,486
Available-for-sale securities	9,673	6,472
Deferred tax assets, net	2,398	3,418
Other assets	371	401
Total assets	42,354	42,544
Current liabilities:
Accounts payable	2,647	1,973
Accrued compensation and related taxes	1,280	2,193
Accrued warranty expense	846	650
Accrued other expenses and other current liabilities	402	169
Dividends payable	1,242	1,235
Deferred revenue	144	142
Total current liabilities	6,561	6,362
Deferred revenue	382	408
Total liabilities	6,943	6,770
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; 13,844,584 and 13,754,749 issued and outstanding shares at March 31, 2017 and December 31, 2016, respectively	8,307	8,253
Additional paid-in capital	25,513	25,382
Accumulated earnings (deficit)	(2,270)	240
Accumulated other comprehensive income	4,120	2,061
Treasury stock, at cost, 49,722 and 30,422 at March 31, 2017 and December 31, 2016 respectively	(259)	(162)
Total stockholders' equity	35,411	35,774
Total liabilities and stockholders' equity	$ 42,354	$ 42,544