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Employee Benefit Plans (Details) (USD $)	3 Months Ended		6 Months Ended
Employee Benefit Plans (Details) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summary of employee benefits charged to operating expenses
Payroll taxes	$ 283,947	$ 264,350	$ 579,139	$ 578,879
Medical plans	440,645	434,470	898,148	876,789
401k match	81,131	67,414	147,719	135,013
Pension Plan	329,953	227,592	659,907	455,185
Profit-sharing	56,000	48,000	158,000	71,000
Other	124,484	58,405	173,298	99,968
Total employee benefits	$ 1,316,160	$ 1,100,231	$ 2,616,211	$ 2,216,834

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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