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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net loss	$ (129,221)	$ (179,284)
Adjustments to reconcile net loss to net cash provided (used) by operating activities:
Depreciation and amortization	211,754	229,807
Unrealized gain on investments	(43,102)
(Increase) decrease in assets:
Accounts receivable	263,928	1,639,349
Inventories	130,992	(603,916)
Other current assets	(73,290)	(24,446)
Increase (decrease) in liabilities:
Accounts payable	(522,320)	(698,127)
Other accrued liabilities	(554,745)	234,068
Insurance proceeds		(149,792)
Income taxes payable		11,477
Net cash provided (used) by operating activities	(716,004)	459,136
Cash flows from investing activities:
Purchase of property, plant, and equipment	(29,485)	(76,294)
Investments	(4,515,612)
Net cash used by investing activities	(4,545,097)	(76,294)
Cash flows from financing activities:
Repayments of long-term debt	(102,454)	(111,370)
Payment of Preferred Stock dividends	(55,113)	(55,113)
Net cash used by financing activities	(157,567)	(166,483)
Net increase (decrease) in cash and cash equivalents	(5,418,668)	216,359
Cash and cash equivalents at:
Beginning of period	9,647,292	14,877,899
End of period	4,228,624	15,094,258
Supplemental schedule of cash flow information:
Interest paid	45,875	50,391
Supplemental schedule of noncash investing and financing activities:
Preferred dividends declared, not paid	$ 55,113	$ 55,113

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