Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) (USD $)	Jan. 25, 2013	Apr. 27, 2012
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, gross	$ 56,347,950	$ 49,992,309
Accumulated depreciation	(30,469,657)	(27,831,638)
Property, Plant and Equipment, net, total	25,878,293	22,160,671
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, gross	1,128,813	631,000
Building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, gross	16,539,967	15,810,649
Equipment, furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, gross	32,436,210	30,258,410
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, gross	1,021,007	1,018,710
Capital investment in process [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, gross	$ 5,221,953	$ 2,273,540

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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