Statements of Cash Flows - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 4,761,711	$ 4,352,331
Adjustments to reconcile net income to net cashprovided by operating activities:
Depreciation and amortization	175,810	191,942
Net (gain) loss on marketable securities	(431,076)	333,138
Loss on trade-in of equipment		12,837
Bad debt expense (recovery)	4,283	(4,325)
Reserve for inventories	15,000
Deferred income taxes	133,272	219,728
(Increase) decrease in operating assets:
Accounts receivable	(430,127)	237,173
Inventories	249,874	(141,628)
Prepaid expenses and other current assets	(11,102)	(1,400)
Prepaid income taxes	35,387	(200,356)
Other assets		15,000
(Decrease) increase in operating liabilities:
Accounts payable	(115,412)	(167,488)
Accrued expenses	88,491	159,308
Income taxes payable	0	(55,848)
Net cash provided by operating activities	4,476,111	4,950,412
Cash flows from investing activities:
Acquisitions of property, plant and equipment	(113,769)	(74,993)
Purchases of marketable securities	(14,779,161)	(8,256,570)
Proceeds from sales of marketable securities	15,964,917	8,022,804
Net cash provided by (used in) investing activities	1,071,987	(308,759)
Cash flows from financing activities:
Dividends paid	(5,049,922)	(4,816,239)
Net cash used in financing activities	(5,049,922)	(4,816,239)
Net increase (decrease) in cash and cash equivalents	498,176	(174,586)
Cash and cash equivalents, beginning of year	550,135	724,721
Cash and cash equivalents, end of year	1,048,311	550,135
Non-cash investing activities:
Cost of equipment traded-in (net)		39,837
Supplemental disclosure of cash flow information
Taxes paid	1,100,000	1,150,000
Supplemental disclosure of non-cash dividend on unexchanged shares	$ 3,829	$ 7,796

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