Condensed Consolidated Balance Sheets - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 10,580,000	$ 6,826,000
Trade accounts receivable, net	8,229,000	6,466,000
Inventories, net	16,978,000	10,545,000
Prepaid expenses and other current assets	1,634,000	1,878,000
Total current assets	37,421,000	25,715,000
Property, plant and equipment, net	4,556,000	3,566,000
Right-of-use (ROU) asset	2,399,000	2,887,000
ASSETS
Investment in securities	1,795,000	2,014,000
Deferred tax assets, net	4,116,000	4,300,000
Other assets	98,000	112,000
Total assets	50,385,000	38,594,000
Current liabilities:
Accounts payable	5,883,000	5,119,000
Accrued warranty expense	533,000	791,000
Accrued compensation and related taxes	1,099,000	1,635,000
Accrued other expenses and other current liabilities	938,000	307,000
Dividends payable	505,000	250,000
Short-term lease liability	447,000	525,000
Credit facility	1,470,000	0
Notes payable-current portion	267,000	82,000
Deferred revenue	1,045,000	757,000
Total current liabilities	12,187,000	9,466,000
Notes payable, net of current portion	605,000	247,000
Long-term lease liability	2,269,000	2,702,000
Deferred revenue	2,706,000	2,551,000
Total liabilities	17,767,000	14,966,000
Stockholders' equity:
Preferred stock; $1.00 par value; 1,000,000 authorized shares; none issued or outstanding	0	0
Common stock; $.60 par value; 50,000,000 authorized shares; 18,298,999 and 13,962,366 issued and 16,848,599 and 12,511,966 outstanding shares at December 31, 2021, and 2020, respectively	10,979,000	8,377,000
Additional paid-in capital	35,862,000	26,346,000
Accumulated deficit	(8,821,000)	(5,693,000)
Treasury stock, at cost, 1,450,400 shares at December 31, 2021 and 2020	(5,402,000)	(5,402,000)
Total stockholders' equity	32,618,000	23,628,000
Total liabilities and stockholders' equity	$ 50,385,000	$ 38,594,000