STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (226,147)	$ (65,061)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	836,877	760,772
Amortization	38,265	33,768
Stock based compensation	23,561	25,007
Net gain on sale and disposal of property, plant and equipment	(28,689)	(5,750)
Deferred income taxes	(302,000)	61,000
Changes in working capital components:
Trade receivables	146,241	(171,307)
Inventories	(99,893)	133,633
Prepaid expenses and other assets	193,663	(276,257)
Income tax receivable	64,003	36,831
Accounts payable	(408,526)	310,141
Accrued expenses	(32,666)	74,170
Net cash provided by operating activities	204,689	916,947
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant, equipment and construction in progress	(230,089)	(2,064,426)
Proceeds from sale of property and equipment	32,635	21,000
Purchases of intangibles	(38,977)	(27,146)
Purchases of short-term investments	(3,875,000)	(4,379,000)
Proceeds on sale of short-term investments	4,226,000	1,133,000
Net cash provided by (used in) investing activities	114,569	(5,316,572)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from long-term debt		3,415,000
Payment of debt issuance costs		(139,418)
Payments on long-term debt	(139,690)	(79,475)
Repurchase of common stock	(300,466)
Proceeds from exercise of stock options	1,885	3,765
Net cash (used in) provided by financing activities	(438,271)	3,199,872
NET DECREASE IN CASH AND CASH EQUIVALENTS	(119,013)	(1,199,753)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,048,713	2,248,466
CASH AND CASH EQUIVALENTS AT END OF PERIOD	929,700	1,048,713
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for interest	70,990	43,421
Cash received for income taxes, net	$ 60,003	$ 102,234