CONDENSED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (594,916)	$ (71,321)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	634,648	552,885
Amortization	28,724	24,094
Stock based compensation	17,527	18,384
Net gain on sale and disposal of property, plant and equipment	(32,635)	(5,750)
Changes in working capital components:
Trade receivables	692,269	10,962
Inventories	(560,137)	40,672
Prepaid expenses and other assets	257,696	(92,873)
Income tax receivable	(261,614)	31,234
Accounts payable	70,312	326,996
Accrued expenses	(104,254)	(31,098)
Net cash provided by operating activities	147,620	804,185
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant, equipment and construction in progress	(189,966)	(1,966,150)
Proceeds from sale of property and equipment	32,635	21,000
Purchases of intangibles	(32,420)	(25,842)
Purchases of short-term investments	(1,915,000)	(3,399,000)
Proceeds on sale of short-term investments	3,246,000
Net cash provided by (used in) investing activities	1,141,249	(5,369,992)
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	(104,436)	(44,974)
Repurchase of common stock	(233,787)
Proceeds from exercise of stock options	1,885	3,765
Net cash (used in) provided by financing activities	(336,338)	3,234,373
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	952,531	(1,331,434)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,048,713
CASH AND CASH EQUIVALENTS AT END OF PERIOD	2,001,244	917,032
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Construction in progress included in accounts payable		8,778
Cash paid for interest	53,574	25,252
Cash received (paid) for income taxes, net of $7,436 paid in 2017	$ 60,003	$ 100,649