Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income	$ 4,079,202	$ 1,724,738
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	670,623	646,105
Deferred income taxes	40,670	24,059
Stock based compensation	22,220	13,260
Provision for bad debts	132,711	942
Provision for slow moving and obsolete inventory	35,404
Impairment of equipment	65,725
Other operating non-cash items	(904)	1,151
Cash used related to 2019 chemical incident	(200,665)
Gain on insurance settlement	(126,210)
Changes in assets and liabilities:
Trade accounts receivable	(5,839,993)	(2,896,709)
Receivables due from affiliated companies	(423,584)	106,239
Inventories	(2,155,642)	402,838
Prepaid expenses and other current assets	52,790	190,361
Accounts payable - trade	1,241,808	8,327
Income taxes payable	1,008,546	58,769
Accrued expenses payable	906,494	(20,941)
Net cash (used in) provided by operating activities	(490,805)	259,139
Cash flows from investing activities:
Insurance proceeds received for damaged machinery and equipment	411,657
Purchases of property, plant and equipment	(1,219,653)	(429,264)
Net cash used in investing activities	(807,996)	(429,264)
Cash flows from financing activities:
Payments on long-term debt	(253,867)	(222,761)
Borrowings on revolving line of credit		1,000,000
Repayments on revolving line of credit		(600,000)
Proceeds from CARES Act note	1,556,800
Repayment of CARES Act note	(1,556,800)
Dividends paid to common shareholders	(378,484)	(468,306)
Proceeds from exercise of stock options	20,700	13,799
Net cash used in financing activities	(611,651)	(277,268)
Effect of exchange rate on cash	(478)	859
Net decrease in cash and restricted cash	(1,910,930)	(446,534)
Cash and restricted cash at beginning of period	8,010,420	3,733,924
Cash and restricted cash at end of period	6,099,490	3,287,390
Supplemental disclosure of cash flow information:
Cash paid for interest during period	72,107	80,594
Cash paid for income taxes during period	39,484	411,009
Cash paid under operating lease	47,400	47,400
Cash	4,677,344	1,111,427
Restricted cash	1,422,146	2,175,963
Total cash and restricted cash	6,099,490	3,287,390
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	96,039	44,979
Total lease right to use assets exchanged for lease liabilities	$ 96,039	$ 477,445