Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 4,676	$ 11,268
Trade accounts receivable, net	3,964	5,721
Inventories, net	13,513	11,466
Prepaid expenses and other current assets	1,733	2,401
Total current assets	23,886	30,856
Property, plant and equipment, net	3,964	2,729
Right-of-use (ROU) asset	2,885	0
Investment in securities	2,635	1,919
Deferred tax assets, net	4,373	3,495
Other assets	197	192
Total assets	37,940	39,191
Current liabilities:
Accounts payable	5,310	5,595
Accrued compensation and related taxes	1,271	2,014
Accrued warranty expense	1,248	1,546
Accrued other expenses and other current liabilities	479	292
Dividends payable	252	256
Short-term lease liability	369	0
Note payable-current portion	78	0
Deferred revenue	369	180
Total current liabilities	9,376	9,883
Note payable, net of current portion	328	0
Long-term lease liability	2,606	0
Deferred revenue	2,354	1,596
Total liabilities	14,664	11,479
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; 13,929,381 and 13,882,937 issued and 12,596,923 and 12,817,829 outstanding shares at December 31, 2019 and 2018, respectively	8,357	8,330
Additional paid-in capital	26,095	25,867
Retained earnings	(6,043)	(2,393)
Treasury stock, at cost, 1,332,458 and 1,065,108 shares at December 31, 2019 and 2018, respectively	(5,133)	(4,092)
Total stockholders' equity	23,276	27,712
Total liabilities and stockholders' equity	$ 37,940	$ 39,191