Acquisitions (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Consideration paid
Purchase holdback	$ 600,000
Contingent note payable, at present value	692,000
PAC
Acquisitions
Lease term prior to acquisition	2 years
Consideration paid
Cash	4,400,000
Purchase holdback	600,000
Contingent note payable, at present value	692,000
Fair value of total consideration transferred	5,692,000
Acquisition costs (professional fees) included in SG&A	57,000
Recognized amounts of identifiable assets acquired:
Cash	803,425
Accounts receivable	1,374,853
Inventory	737,414
Other assets	54,422
Fixed assets	816,633
Goodwill	557,594
Total identifiable net assets	6,193,341
Accounts payable	(312,207)
Accrued Expenses	(189,134)
Net assets acquired	5,692,000
Gross accounts receivable acquired	1,404,853
Deemed uncollectible receivable	30,000
Weighted average amortization period of intangible assets	5 years
Contingent note payable to sellers, before discounts	800,000
Note payable, repayment term	2 years
Imputed interest rate to discount debt instrument issued in contingent consideration	2.00%
Probability of payment	90.00%
Unaudited pro forma condensed consolidated statement of operations
Sales	141,273,675	137,616,612
Net income	11,558,968	10,947,772
Earnings Per Share:
Basic (in dollars per share)	$ 1.73	$ 1.69
Diluted (in dollars per share)	$ 1.64	$ 1.56
PAC | Non-compete
Recognized amounts of identifiable assets acquired:
Intangible assets	312,000
PAC | Customer list
Recognized amounts of identifiable assets acquired:
Intangible assets	$ 1,537,000