Annual report pursuant to Section 13 and 15(d)

Supplemental Retirement Plan and Related Post Retirement Benefits (Details Textual)

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Supplemental Retirement Plan and Related Post Retirement Benefits (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 06, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]          
Expected benefit payments     $ 300,000    
Expected benefit payments, year two     300,000    
Expected benefit payments, year three     300,000    
Expected benefit payments, year four     300,000    
Expected benefit payments, year five     300,000    
Benefits to be paid in each of the next five years     1,500,000    
Supplemental Retirement Plan and Related Post Retirement Benefits (Textual) [Abstract]          
Projected benefit obligation       5,800,000  
Accumulated benefit obligation of the plans     9,500,000   5,900,000
Assets existing for retirement plans     0   0
Unrecognized prior service costs     3,800,000    
Unrecognized prior service costs, net     5,800,000    
Unrecognized prior service costs, tax     2,000,000    
Unrecognized actuarial losses     2,100,000    
Unrecognized actuarial losses, net     3,300,000    
Unrecognized actuarial losses, tax     1,200,000    
Net periodic pension cost     300,000    
Net periodic pension cost net of tax     500,000    
Net periodic pension cost, tax     200,000    
Defined benefit plan amortization of net gains losses net of taxes     100,000    
Defined benefit plan unfunded status of plan     0    
Current accrued pension liability     300,000    
Long-term accrued pension liability     14,700,000    
Annual increase in the cost of health care benefits 10.80% 5.70%      
Minimum [Member]
          
Defined Benefit Plan Disclosure [Line Items]          
Annual increase in the cost of health care benefits range     5.10%    
Maximum [Member]
          
Defined Benefit Plan Disclosure [Line Items]          
Annual increase in the cost of health care benefits range     6.10%    
SERP [Member]
          
Defined Benefit Plan Disclosure [Line Items]          
Expected benefit payments     43,000    
Expected benefit payments, year two     43,000    
Expected benefit payments, year three     43,000    
Expected benefit payments, year four     43,000    
Expected benefit payments, year five     43,000    
Benefits to be paid in each of the next five years     $ 200,000