Stock Appreciation Rights (Details) (USD $)	3 Months Ended		9 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
SARS Valuation Assumptions [Line Items]
Allocated Share-based Compensation Expense			$ 148,000	$ 72,000
Stock Appreciation Rights (SARs) [Member]
SARS Valuation Assumptions [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	280,000	320,000	280,000	320,000
Stock Appreciation Rights, Weighted Average Grant Price	$ 0.415	$ 0.409	$ 0.415	$ 0.409
Stock Appreciation Rights, Weighted Average Contractual Life Remaining	0.29	5.10	0.29	5.10
Stock Appreciation Rights, Weighted Average Market Price			$ 1.194	$ 0.530
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate			136.35%	148.76%
Weighted Average Expected Life	0.24	4.60	0.24	4.60
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate			0.00%	0.80%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate			0.00%	0.00%
Stock Appreciation Rights, Weighted Average Fair Value Price			$ 0.710	$ 0.498
Weighted Average Aggregate Fair Value			213,000	110,000
Weighted Average Aggregate Intrinsic Value			204,000	33,000
Stock Appreciation Rights Recovery	(69,000)
Allocated Share-based Compensation Expense		63,000	148,000	72,000
Unrecognized Compensation Expense Related to Non-Vested SARS Granted			0	24,000
Expected Period to Recognize Compensation Expense Related to Non-Vested SARSs Granted	0.00	1.87	0.00	1.87
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent	$ 213,000	$ 124,000	$ 213,000	$ 124,000
Stock Appreciation Rights (SARs) [Member] | Maximum [Member]
SARS Valuation Assumptions [Line Items]
Stock Appreciation Rights, Upper Range of Grant Price	$ 0.695	$ 0.695	$ 0.695	$ 0.695
Stock Appreciation Rights (SARs) [Member] | Minimum [Member]
SARS Valuation Assumptions [Line Items]
Stock Appreciation Rights, Lower Range of Grant Price	$ 0.208	$ 0.208	$ 0.208	$ 0.208