Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 11,349	$ 7,147
Available-for-sale-securities	0	9,184
Trade accounts receivable, net	7,407	5,524
Inventories, net	10,688	14,358
Prepaid expenses and other current assets	1,641	772
Total current assets	31,085	36,985
Property, plant and equipment, net	2,619	2,201
Investment in securities	3,198	0
Deferred tax assets, net	3,122	3,317
Other assets	215	298
Total assets	40,239	42,801
Current liabilities:
Accounts payable	3,496	5,971
Accrued compensation and related taxes	1,652	1,364
Accrued warranty expense	1,434	1,389
Accrued other expenses and other current liabilities	414	1,159
Dividends payable	268	273
Deferred revenue	179	157
Total current liabilities	7,443	10,313
Deferred revenue	1,422	481
Total liabilities	8,865	10,794
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; 13,882,937 and 13,844,584 issued and 13,389,519 and 13,652,490 outstanding shares at September 30, 2018 and December 31, 2017, respectively	8,330	8,307
Additional paid-in capital	25,796	25,642
Accumulated deficit	(789)	(5,450)
Accumulated other comprehensive income	0	4,318
Treasury stock, at cost, 493,418 and 192,094 shares at September 30, 2018 and December 31, 2017, respectively	(1,963)	(810)
Total stockholders' equity	31,374	32,007
Total liabilities and stockholders' equity	$ 40,239	$ 42,801