Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income	$ 8,736,032	$ 2,849,393
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,020,179	967,628
Deferred income taxes	88,377	54,399
Stock based compensation	22,220	275,540
Provision for bad debts	213,398	32,908
Provision for slow moving and obsolete inventory	47,146
Impairment of equipment	65,725
Other operating non-cash items	(1,061)	(884)
Cash used related to 2019 chemical incident	(200,665)
Gain on insurance settlement	(126,210)
Changes in assets and liabilities:
Trade accounts receivable	(9,343,556)	(4,628,183)
Receivables due from affiliated companies	(145,840)	195,963
Inventories	(2,812,905)	677,828
Prepaid expenses and other current assets	(43,784)	(104,008)
Accounts payable - trade	2,709,747	1,068,715
Income taxes payable	267,402	172,242
Accrued expenses payable	881,019	26,362
Net cash provided by operating activities	1,377,224	1,587,903
Cash flows from investing activities:
Insurance proceeds received for damaged machinery and equipment	411,657
Purchases of property, plant and equipment	(1,549,077)	(526,775)
Net cash used in investing activities	(1,137,420)	(526,775)
Cash flows from financing activities:
Payments on long-term debt	(381,616)	(335,015)
Borrowings on revolving line of credit		1,000,000
Repayments on revolving line of credit		(1,000,000)
Payments for taxes related to net share settlements of stock awards		(20,949)
Proceeds from CARES Act note	1,556,800
Repayment of CARES Act note	(1,556,800)
Dividends paid to common shareholders	(567,726)	(468,306)
Proceeds from exercise of stock options	20,700	13,799
Net cash used in financing activities	(928,642)	(810,471)
Effect of exchange rate on cash	(602)	1,662
Net (decrease) increase in cash and restricted cash	(689,440)	252,319
Cash and restricted cash at beginning of period	8,010,420	3,733,924
Cash and restricted cash at end of period	7,320,980	3,986,243
Supplemental disclosure of cash flow information:
Cash paid for interest during period	107,147	120,164
Cash paid for income taxes during period	2,029,484	586,009
Cash paid under operating lease	71,100	71,100
Cash	6,581,944	2,109,439
Restricted cash	739,036	1,876,804
Total cash and restricted cash	7,320,980	3,986,243
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