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Retirement Benefit Plans (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Pension expense $ 100,000 $ 22,000 $ 201,000 $ 43,000  
Required 2012 pension contributions 1,643,000   1,643,000    
Current contributions     559,000 500,000  
Accumulated other comprehensive income (5,463,000)   (5,463,000)   (5,624,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax 1,964,301   1,964,301    
Supplemental Employee Retirement Plans, Defined Benefit
          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Pension expense 123,000 119,000 246,000 237,000  
SERP credited service period (years) 10 years        
Percentage of final 3 year average salary in which retirement benefit is based (percentage)     20.00%    
Number of final years in which the Retirement Benefit is based (years)     3 years    
Retirement age (years)     65 years    
Period of time that vested retirement benefit will be paid after death or change in control (days)     90 days    
Years of monthly installments associated with SERP disability (years)     15 years    
SERP unfunded long-term liability 1,964,301   1,964,301    
Deferred tax asset 746,000   746,000    
Accumulated other comprehensive income         1,218,301
Prior service cost     $ 263,664    
Gradall Company Hourly Employees Pension Plan
          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Former Employees Covered By Pension Plan     328    
Current employees covered in the Gradall Company Hourly Employees' Pension Plan who were formerly employeed by former parent (Employees)     148    
Gradall Company Hourly Employees Retirement Plan
          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Former Employees Covered By Pension Plan     236    
Current employees covered in the Gradall Company Hourly Employees' Pension Plan who were formerly employeed by former parent (Employees)     92