CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 15,661,000	$ 6,826,000
Trade accounts receivable, net	7,210,000	6,466,000
Inventories, net	12,036,000	9,441,000
Prepaid expenses and other current assets	1,866,000	1,878,000
Total current assets	36,773,000	24,611,000
Property, plant and equipment, net	4,426,000	3,566,000
Right-of-use (ROU) asset	2,594,000	2,887,000
Investment in securities	4,481,000	2,014,000
Deferred tax assets, net	4,116,000	4,300,000
Other assets	101,000	112,000
Total assets	52,491,000	37,490,000
Current liabilities:
Accounts payable	6,316,000	5,119,000
Accrued compensation and related taxes	1,481,000	1,635,000
Accrued warranty expense	644,000	791,000
Accrued other expenses and other current liabilities	364,000	307,000
Dividends payable	0	250,000
Short-term lease liability	428,000	525,000
Credit facility	1,470,000	0
Notes payable-current portion	262,000	82,000
Deferred revenue	934,000	757,000
Total current liabilities	11,899,000	9,466,000
Notes payable, net of current portion-	740,000	247,000
Long-term lease liability	2,498,000	2,702,000
Deferred revenue-	2,327,000	2,551,000
Total liabilities	17,464,000	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; 18,236,121 and 13,962,366 issued and 16,785,721 and 12,511,966 outstanding shares at June 30, 2021, and December 31, 2020, respectively	10,941,000	8,377,000
Additional paid-in capital	35,534,000	26,346,000
Accumulated deficit	(6,046,000)	(6,797,000)
Treasury stock, at cost, 1,450,400 shares at June 30, 2021, and December 31, 2020, respectively	(5,402,000)	(5,402,000)
Total stockholders' equity	35,027,000	22,524,000
Total liabilities and stockholders' equity	$ 52,491,000	$ 37,490,000