CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 14,087,000	$ 6,826,000
Trade accounts receivable, net	7,646,000	6,466,000
Inventories, net	15,981,000	10,545,000
Prepaid expenses and other current assets	1,941,000	1,878,000
Total current assets	39,655,000	25,715,000
Property, plant and equipment, net	4,454,000	3,566,000
Right-of-use (ROU) asset	2,497,000	2,887,000
Investment in securities	2,324,000	2,014,000
Deferred tax assets, net	4,116,000	4,300,000
Other assets	88,000	112,000
Total assets	53,134,000	38,594,000
Current liabilities:
Accounts payable	7,520,000	5,119,000
Accrued compensation and related taxes	1,522,000	1,635,000
Accrued warranty expense	666,000	791,000
Accrued other expenses and other current liabilities	836,000	307,000
Dividends payable	336,000	250,000
Short-term lease liability	437,000	525,000
Credit facility	1,470,000	0
Notes payable-current portion	264,000	82,000
Deferred revenue	992,000	757,000
Total current liabilities	14,043,000	9,466,000
Notes payable, net of current portion	673,000	247,000
Long-term lease liability	2,385,000	2,702,000
Deferred revenue	2,789,000	2,551,000
Total liabilities	19,890,000	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; 20,000,000 authorized shares; 18,264,736 and 13,962,366 issued and 16,814,336 and 12,511,966 outstanding shares at September 30, 2021, and December 31, 2020, respectively	10,958,000	8,377,000
Additional paid-in capital	35,701,000	26,346,000
Accumulated deficit	(8,013,000)	(5,693,000)
Treasury stock, at cost, 1,450,400 shares at September 30, 2021, and December 31, 2020, respectively	(5,402,000)	(5,402,000)
Total stockholders' equity	33,244,000	23,628,000
Total liabilities and stockholders' equity	$ 53,134,000	$ 38,594,000