Accrued Liabilities (Tables)

12 Months Ended

Apr. 30, 2012

Payables and Accruals [Abstract]

Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]

	2012		2011
Employee related expenses:
Accrued payroll	$	111,000	$	110,000
Accrued payroll taxes	42,000		40,000
Accrued employee benefits	43,000		28,000
	196,000		178,000
Other, including interest:
Warranty reserve	20,000		36,000
Property taxes	12,000		24,000
Deferred director compensation	52,000		80,000
Other	1,000		18,000
	85,000		158,000
	$	281,000	$	336,000