Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 11,268	$ 7,147
Available-for-sale securities	0	9,184
Trade accounts receivable, net	5,721	5,524
Inventories, net	11,466	14,358
Prepaid expenses and other current assets	2,401	772
Total current assets	30,856	36,985
Property, plant and equipment, net	2,729	2,201
Investment in securities	1,919	0
Deferred tax assets, net	3,495	3,317
Other assets	192	298
Total assets	39,191	42,801
Current liabilities:
Accounts payable	5,595	5,971
Accrued compensation and related taxes	2,014	1,364
Accrued warranty expense	1,546	1,389
Accrued other expenses and other current liabilities	292	1,159
Dividends payable	256	273
Deferred revenue	180	157
Total current liabilities	9,883	10,313
Deferred revenue	1,596	481
Total liabilities	11,479	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 12,817,829 and 13,652,490 outstanding shares at December 31, 2018 and 2017, respectively	8,330	8,307
Additional paid-in capital	25,867	25,642
Retained earnings	(2,393)	(5,450)
Accumulated other comprehensive income	0	4,318
Treasury stock, at cost, 1,065,108 and 192,094 shares at December 31, 2018 and 2017, respectively	(4,092)	(810)
Total stockholders' equity	27,712	32,007
Total liabilities and stockholders' equity	$ 39,191	$ 42,801