CONDENSED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net loss	$ (1,190,407)	$ (2,605,917)
Adjustments to reconcile loss to net cash used by operating activities:
Provision for doubtful accounts		(81,152)
Share-based compensation		652,862
Depreciation and amortization	669,584	603,580
(Increase) decrease in operating assets:
Accounts receivable	629,861	(1,897,332)
Inventories	(1,179,252)	(336,023)
Other current assets	13,624	(313,108)
Increase (decrease) in operating liabilities:
Accounts payable	(49,414)	574,258
Other accrued liabilities	821,128	507,768
Insurance proceeds	(153,869)	876,250
Income taxes payable	(1,173)
Net cash used by operating activities	(439,918)	(2,018,814)
Cash flows from investing activities
Purchase of property, plant, and equipment	(290,153)	(172,305)
Net cash used by investing activities	(290,153)	(172,305)
Cash flows from financing activities
Repayments of long-term debt	(341,795)	(326,227)
Proceeds from sale of common stock		2,350,100
Payment of Preferred Stock dividends	(165,337)	(165,339)
Net cash provided (used) by financing activities	(507,132)	1,858,534
Net decrease in cash and cash equivalents	(1,237,203)	(332,585)
Cash and cash equivalents at:
Beginning of period	14,877,899	16,199,043
End of period	13,640,696	15,866,458
Supplemental schedule of cash flow information:
Interest paid	136,445	159,053
Income taxes paid	1,050	2,000
Supplemental schedule of noncash investing and financing activities:
Preferred dividends declared, not paid	$ 55,113	$ 55,113