Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income	$ 626,881	$ 715,170
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	330,374	320,791
Deferred income taxes	25,315	(5,452)
Provision for bad debts	15,935	(32,700)
Provision for slow moving and obsolete inventory	35,404
Other operating non-cash items	(483)	1,076
Cash used related to 2019 chemical incident	(200,665)
Gain on insurance settlement	(126,210)
Changes in assets and liabilities:
Trade accounts receivable	711,965	(1,001,849)
Receivables due from affiliated companies	(233,430)	(470,895)
Inventories	(1,840,769)	(439,011)
Prepaid expenses and other current assets	(68,564)	(79,447)
Accounts payable - trade	949,090	114,678
Accrued expenses payable	62,971	271,394
Net cash provided by (used in) operating activities	287,814	(606,245)
Cash flows from investing activities:
Insurance proceeds received for damaged machinery and equipment	411,657
Purchases of property, plant and equipment	(541,104)	(303,901)
Net cash used in investing activities	(129,447)	(303,901)
Cash flows from financing activities:
Payments on long-term debt	(126,673)	(111,346)
Proceeds from exercise of stock options		13,799
Net cash used in financing activities	(126,673)	(97,547)
Effect of exchange rate on cash	(1,845)	421
Net increase (decrease) in cash and restricted cash	29,849	(1,007,272)
Cash and restricted cash at beginning of period	8,010,420	3,733,924
Cash and restricted cash at end of period	8,040,269	2,726,652
Supplemental disclosure of cash flow information:
Cash paid for interest during period	36,261	38,065
Cash paid for income taxes during period	45,000
Cash paid under operating lease	23,700	23,700
Cash	6,148,351	563,426
Restricted cash	1,891,918	2,163,226
Total cash and restricted cash	8,040,269	2,726,652
Noncash lease activities:
Operating lease right to use asset exchanged for operating lease liability		432,466
Finance lease right to use assets exchanged for finance lease liabilities		44,979
Total lease right to use assets exchanged for lease liabilities		$ 477,445