Income Taxes Components of Deferred Tax Assets and Liabilities (Details) (USD $)	Apr. 30, 2012	Apr. 30, 2011
Components of Deferred Taxes [Line Items]
Operating Loss Carryforwards	$ 1,359,000	$ 1,425,000
Deferred Tax Assets, Inventory	150,000	157,000
Deferred Tax Assets, Intangible Assets	271,000	391,000
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses	427,000	427,000
Tax Credit Carryforward, Deferred Tax Asset	143,000	148,000
Deferred Tax Assets, Other	91,000	121,000
Deferred Tax Assets, Gross	2,441,000	2,669,000
Deferred Tax Assets, Valuation Allowance	1,833,000	2,061,000
Deferred Tax Assets, Net of Valuation Allowance	$ 608,000	$ 608,000