Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Details Textual)

v2.4.0.6
Employee Benefit Plans (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Employee Benefit Plan (Additional Textual) [Abstract]      
Employee's years of service and average earnings Five highest consecutive calendar years of compensation in ten-year period preceding retirement    
Accumulated benefit obligation $ 27,809 $ 25,507  
Employer contribution description Matching contributions equal to 100 percent of the first three of an employee’s salary deferral and 50% of the next two percent of an employee’s salary deferral    
Contribution equal to employee salary deferral 100.00%    
Contribution next to employee salary deferral 3.00%    
Contribution for additional employee salary deferral 50.00%    
Contribution additional next to employee salary deferral 2.00%    
Share of the medical premium cost for family coverage 4    
Share of the medical premium cost for single coverage 2    
Share of the medical premium both family and single coverage for regular retirees 1    
Medical care cost trend rate 5.00%    
Medical care trend year 2019    
Medical care cost trend rate decrements 0.50%    
Current portion of accrued postretirement benefit obligation 107 104  
Employee stock ownership plan, shares 279 292  
Company contributions to the ESOP 0 0 0
Pension plans, defined benefit [Member]
      
Employee Benefit Plans (Textual) [Abstract]      
Estimated net actuarial loss for the pension plan 1,002    
Estimated prior service cost for pension plan 4    
Weighted average discount rate used to develop the net postretirement benefit cost 4.76% 5.63% 6.07%
Pension expense 248 (312) (350)
Other postretirement benefit plans [Member]
      
Employee Benefit Plans (Textual) [Abstract]      
Estimated net actuarial loss for the pension plan 44    
Estimated prior service cost for pension plan (166)    
Weighted average discount rate used to develop the net postretirement benefit cost 3.96% 4.69% 5.15%
Pension expense (83) (84) (82)
Supplemental Executive Retirement Plan [Member]
      
Employee Benefit Plans (Textual) [Abstract]      
Pension expense 24 21 15
Pension expense related liability 254 256  
Current portion of the related liability included in accrued compensation 27 26  
401K Plan [Member]
      
Employee Benefit Plans (Textual) [Abstract]      
Contributions to defined contribution plan 753 457 242
Defined Contribution Pension [Member]
      
Employee Benefit Plans (Textual) [Abstract]      
Contributions to defined contribution plan $ 204 $ 161 $ 117