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Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($)
6 Months Ended
Oct. 18, 2015
Apr. 24, 2015
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 78,206,755 $ 75,711,731
Accumulated depreciation (37,632,361) (35,425,055)
Property, plant and equipment, net, total 40,574,394 40,286,676
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,643,812 1,643,812
Building and building improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 27,724,326 26,709,267
Equipment, software furniture and fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 41,782,337 39,324,945
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,356,786 1,339,033
Capital investment in process [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 5,699,494 $ 6,694,674
Minimum [Member] | Building and building improvements [Member]    
Property, Plant and Equipment [Line Items]    
Lives in years 36 years  
Minimum [Member] | Equipment, software furniture and fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Lives in years 3 years  
Minimum [Member] | Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Lives in years 5 years  
Maximum [Member] | Building and building improvements [Member]    
Property, Plant and Equipment [Line Items]    
Lives in years 39 years  
Maximum [Member] | Equipment, software furniture and fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Lives in years 7 years  
Maximum [Member] | Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Lives in years 8 years