Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) (USD $)	Jul. 26, 2013	Apr. 26, 2013
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, gross	$ 64,343,479	$ 58,823,611
Accumulated depreciation	(31,250,168)	(30,267,869)
Property, Plant and Equipment, net, total	33,093,311	28,555,742
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, gross	1,643,813	1,128,813
Building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, gross	17,315,547	16,646,446
Equipment, furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, gross	33,899,825	33,104,334
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, gross	1,411,672	1,316,088
Capital investment in process [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, gross	$ 10,072,622	$ 6,627,930

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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