CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 6,603,157	$ 9,845,298	$ 7,372,756
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,188,123	6,941,905	6,264,246
Deferred income taxes	332,650	989,473	750,363
Loss on disposal of fixed assets	19,500	138,056	52,293
Gain on acquisition			(601,975)
Stock compensation expense	412,978	307,102	458,800
Change in assets and liabilities:
Receivables	11,150,897	(6,888,027)	(3,182,751)
Inventories	8,245,983	(7,065,372)	(9,813,065)
Income tax receivable	(128,699)	242,228	(242,228)
Other current assets	22,925	(24,035)	(319,340)
Other assets	40,678	109,208	68,214
Accounts payable	(6,004,991)	4,004,111	(4,779,055)
Accrued and other liabilities	(4,640,636)	4,380,101	1,518,524
Net cash provided by (used in) operating activities	23,242,565	12,980,048	(2,453,218)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of fixed assets	(8,654,642)	(7,442,086)	(7,717,102)
Proceeds from sales of fixed assets	17,495	63,012	47,625
Acquisition of business assets			(2,229,000)
Investment in trademarks and patents	(1,176)	(9,446)	(68,452)
Net cash used in investing activities	(8,638,323)	(7,388,520)	(9,966,929)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving credit facility	68,423,672	75,190,968	78,622,969
Repayments on revolving credit facility	(80,993,956)	(77,308,793)	(63,696,111)
Debt financing costs		(54,647)	(58,738)
Proceeds from stock options	8,742
Dividends paid on common stock	(3,252,254)	(3,017,979)	(2,254,935)
Net cash (used in) provided by financing activities	(15,813,796)	(5,190,451)	12,613,185
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(1,209,554)	401,077	193,038
CASH AND CASH EQUIVALENTS:
BEGINNING OF PERIOD	4,616,694	4,215,617	4,022,579
END OF PERIOD	$ 3,407,140	$ 4,616,694	$ 4,215,617