Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 10,723	$ 7,147
Available-for-sale-securities	0	9,184
Trade accounts receivable, net	6,983	5,524
Inventories, net	12,781	14,358
Prepaid expenses and other current assets	871	772
Total current assets	31,358	36,985
Property, plant and equipment, net	2,367	2,201
Investment in securities	3,389	0
Deferred tax assets, net	3,139	3,317
Other assets	239	298
Total assets	40,492	42,801
Current liabilities:
Accounts payable	3,534	5,971
Accrued compensation and related taxes	1,615	1,364
Accrued warranty expense	1,415	1,389
Accrued other expenses and other current liabilities	974	1,159
Dividends payable	271	273
Deferred revenue	175	157
Total current liabilities	7,984	10,313
Deferred revenue	1,045	481
Total liabilities	9,029	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 13,529,983 and 13,652,490 outstanding shares at June 30, 2018 and December 31, 2017, respectively	8,330	8,307
Additional paid-in capital	25,730	25,642
Accumulated deficit	(1,171)	(5,450)
Accumulated other comprehensive income	0	4,318
Treasury stock, at cost, 352,954 and 192,094 shares at June 30, 2018 and December 31, 2017, respectively	(1,426)	(810)
Total stockholders' equity	31,463	32,007
Total liabilities and stockholders' equity	$ 40,492	$ 42,801