CONDENSED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net loss	$ (179,284)	$ (1,189,945)
Adjustments to reconcile net loss to net cash provided (used) by operating activities:
Share based compensation		234,898
Depreciation and amortization	229,807	206,992
(Increase) decrease in assets:
Accounts receivable	1,639,349	81,198
Inventories	(603,916)	(270,863)
Other current assets	(24,446)	(251,220)
Increase (decrease) in liabilities:
Accounts payable	(698,127)	(10,507)
Other accrued liabilities	234,068	222,279
Insurance proceeds	(149,792)
Income taxes payable	11,477	258
Net cash provided (used) by operating activities	459,136	(976,910)
Cash flows from investing activities
Purchase of property, plant, and equipment	(76,294)	(17,131)
Net cash used by investing activities	(76,294)	(17,131)
Cash flows from financing activities
Repayments of long-term debt	(111,370)	(113,696)
Proceeds from sale of common stock		1,780,000
Payment of preferred stock dividends	(55,113)	(55,113)
Net cash provided (used) by financing activities	(166,483)	1,611,191
Net increase in cash and cash equivalents	216,359	617,150
Cash and cash equivalents at:
Beginning of period	14,877,899	16,199,043
End of period	15,094,258	16,816,193
Supplemental schedule of cash flow information:
Interest paid	50,391	48,064
Supplemental schedule of noncash investing and financing activities:
Preferred dividends declared, not paid	$ 55,113	$ 55,113