CONDENSED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net loss	$ (1,126,990)	$ (2,539,291)
Adjustments to reconcile loss to net cash used by operating activities:
Share-based compensation		470,309
Depreciation and amortization	452,846	405,102
(Increase) decrease in assets:
Accounts receivable	299,330	(203,685)
Inventories	(1,581,179)	(1,032,175)
Other current assets	2,816	(255,859)
Increase (decrease) in liabilities:
Accounts payable	(155,218)	(26,107)
Other accrued liabilities	724,344	128,371
Insurance proceeds	(150,906)	1,004,960
Income taxes payable	210
Net cash used by operating activities	(1,534,747)	(2,048,375)
Cash flows from investing activities
Purchase of property, plant, and equipment	(143,636)	(130,459)
Net cash used by investing activities	(143,636)	(130,459)
Cash flows from financing activities
Repayments of long-term debt	(239,676)	(217,430)
Proceeds from sale of common stock		1,780,000
Payment of Preferred Stock dividends	(110,226)	(110,226)
Net cash provided (used) by financing activities	(349,902)	1,452,344
Net decrease in cash and cash equivalents	(2,028,285)	(726,490)
Cash and cash equivalents at:
Beginning of period	14,877,899	16,199,043
End of period	12,849,614	15,472,553
Supplemental schedule of cash flow information:
Interest paid	93,964	106,090
Income taxes paid	1,050	2,000
Supplemental schedule of noncash investing and financing activities:
Preferred dividends declared, not paid	$ 55,113	$ 55,113