Balance Sheets (Current Period Unaudited) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 355,572	$ 531,213
Marketable securities	6,410,082	7,635,463
Accounts receivable, net of allowance for doubtful accounts of $28,398 at June 30, 2022 and $20,252 December 31, 2021	2,106,537	1,813,346
Inventories, net	1,728,204	1,410,789
Prepaid expenses and other current assets	247,001	192,579
Prepaid income taxes	231,405
Total current assets	11,078,801	11,583,390
Net property, plant, and equipment:
Land	69,000	69,000
Factory equipment and fixtures	4,610,582	4,605,742
Building and improvements	2,861,171	2,853,718
Total property, plant, and equipment	7,540,753	7,528,460
Less: Accumulated depreciation	6,938,109	6,869,598
Total property, plant, and equipment, net	602,644	658,862
TOTAL ASSETS	11,681,445	12,242,252
Current liabilities:
Accounts payable	416,442	410,894
Accrued expenses and other current liabilities	1,545,858	1,627,390
Deferred revenue		190,164
Income taxes payable		88,738
Dividends payable	21,082	20,575
Total current liabilities	1,983,382	2,337,761
Deferred income taxes, net	31,903	83,222
Commitments and contingencies
Stockholders’ equity:
Common stock $.10 par value; 10,000,000 shares authorized; 4,594,319 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively	459,432	459,432
Retained earnings	9,206,728	9,361,837
Total stockholders’ equity	9,666,160	9,821,269
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 11,681,445	$ 12,242,252