Income Taxes Components of Deferred Tax Assets and Liabilities (Details) (USD $)	Apr. 30, 2013	Apr. 30, 2012
Components of Deferred Taxes [Line Items]
Operating Loss Carryforwards	$ 1,095,000	$ 1,359,000
Deferred Tax Assets, Inventory	146,000	150,000
Deferred Tax Assets, Intangible Assets	175,000	271,000
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses	427,000	427,000
Tax Credit Carryforward, Deferred Tax Asset	130,000	143,000
Deferred Tax Assets, Other	81,000	91,000
Deferred Tax Assets, Gross	2,054,000	2,441,000
Deferred Tax Assets, Valuation Allowance	1,214,000	1,833,000
Deferred Tax Assets, Net of Valuation Allowance	$ 840,000	$ 608,000