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STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net loss	$ (1,339,943)	$ (3,736,038)	$ (3,694,907)
Adjustments to reconcile loss to net cash used by operating activities:
Depreciation and amortization	886,814	834,951	872,868
Share-based compensation		672,223	387,726
Inventories reserve	(297,731)		176,424
Provision for doubtful accounts	47,793	24,272	92,000
Impairment of assets			456,119
(Increase) decrease in assets:
Accounts receivable	145,407	(1,861,990)	1,541,159
Inventories	(1,041,202)	811,063	(897,023)
Other current assets	(226,649)	(225,606)	1,375,484
Income taxes receivable	(13,266)	(188,456)
Other assets			(750)
Increase (decrease) in liabilities:
Accounts payable	411,927	485,994	(1,225,762)
Other accrued liabilities	699,030	(205,342)	119,342
Insurance proceeds	(466,293)	466,293
Income taxes payable	(1,382)		2,408
Net cash used by operating activities	(1,195,495)	(2,922,636)	(794,912)
Cash flows from investing activities:
Purchase of property, plant, and equipment	(382,156)	(91,878)	(1,947,172)
Investments	(2,986,156)
Net cash used by investing activities	(3,368,312)	(91,878)	(1,947,172)
Cash flows from financing activities:
Repayments of long-term debt	(446,350)	(436,280)	(263,200)
Proceeds from long-term debt			525,017
Proceeds from sale of common stock		2,350,100
Proceeds from the exercise of stock options			855,021
Payment of Preferred Stock dividends	(220,450)	(220,450)	(220,755)
Net cash provided (used) by financing activities	(666,800)	1,693,370	896,083
Net decrease in cash and cash equivalents	(5,230,607)	(1,321,144)	(1,846,001)
Cash and cash equivalents at:
Beginning of period	14,877,899	16,199,043	18,045,044
End of period	9,647,292	14,877,899	16,199,043
Supplemental schedule of cash flow information:
Interest paid	177,190	210,761	213,295
Income taxes paid	1,173	1,031	2,000
Supplemental schedule of noncash investing and financing activities:
Preferred dividends declared, not paid	$ 55,113	$ 55,113	$ 55,113

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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