Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 8,058	$ 7,147
Available-for-sale-securities	0	9,184
Trade accounts receivable, net	7,708	5,524
Inventories, net	15,318	14,358
Prepaid expenses and other current assets	760	772
Total current assets	31,844	36,985
Property, plant and equipment, net	2,151	2,201
Investment in securities	3,036	0
Deferred tax assets, net	3,423	3,317
Other assets	273	298
Total assets	40,727	42,801
Current liabilities:
Accounts payable	4,855	5,971
Accrued compensation and related taxes	1,288	1,364
Accrued warranty expense	1,447	1,389
Accrued other expenses and other current liabilities	956	1,159
Dividends payable	271	273
Deferred revenue	166	157
Total current liabilities	8,983	10,313
Deferred revenue	753	481
Total liabilities	9,736	10,794
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 issued and outstanding shares at March 31, 2018 and December 31, 2017, respectively	8,307	8,307
Additional paid-in capital	25,697	25,642
Accumulated deficit	(1,846)	(5,450)
Accumulated other comprehensive income	0	4,318
Treasury stock, at cost, 285,514 and 192,094 shares at March 31, 2018 and December 31, 2017, respectively	(1,167)	(810)
Total stockholders' equity	30,991	32,007
Total liabilities and stockholders' equity	$ 40,727	$ 42,801