Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 2,795,249	$ 2,603,534
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,175,267	955,161
Deferred income taxes	126,454	(59,472)
Stock based compensation	330,823	324,145
Provision for bad debts	35,145	198,839
Other operating non-cash items	3,378	4,612
Changes in assets and liabilities:
Trade accounts receivable	(729,936)	(230,942)
Receivables due from affiliated companies	538,375	(394,262)
Inventories	(3,021,201)	(479,873)
Prepaid expenses and other current assets	2,572	739
Accounts payable - trade	(334,890)	295,100
Income taxes payable		(1,447)
Accrued expenses payable	296,843	(287,857)
Net cash provided by operating activities	1,218,079	2,928,277
Cash flows from investing activities:
Purchases of property, plant and equipment	(1,358,776)	(5,275,732)
Purchase of intangible assets	(376,722)
Net cash used in investing activities	(1,735,498)	(5,275,732)
Cash flows from financing activities:
Proceeds from long-term debt		4,500,000
Payments on long-term debt	(332,185)	(315,756)
Borrowings on revolving line of credit	2,750,000	1,000,000
Repayments on revolving line of credit	(2,750,000)	(1,000,000)
Payments for taxes related to net share settlements of stock awards	(25,794)	(22,468)
Dividends paid to common shareholders	(555,275)	(549,255)
Payments for debt issuance costs		(196,095)
Proceeds from exercise of stock options		26,400
Net cash (used in) provided by financing activities	(913,254)	3,442,826
Effect of exchange rate on cash	(1,247)	28
Net (decrease) increase in cash and restricted cash	(1,431,920)	1,095,399
Cash and restricted cash at beginning of period	5,165,844	4,070,445
Cash and restricted cash at end of period	3,733,924	5,165,844
Supplemental disclosure of cash flow information:
Cash paid for interest during period	136,031	29,496
Cash paid for income taxes during period	660,000	1,282,400
Cash	1,401,047	2,418,484
Restricted cash	2,332,877	2,747,360
Total cash and restricted cash	3,733,924	5,165,844
Noncash investing and financing activities:
Issuance of note payable for asset acquisition	1,000,000
Imputed interest	(69,472)
Principal portion of note payable issued for asset acquisition	$ 930,528