Accrued Liabilities (Tables)

12 Months Ended

Apr. 30, 2013

Payables and Accruals [Abstract]

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

	2013		2012
Employee related expenses:
Accrued payroll	$	298,000	$	111,000
Accrued payroll taxes	53,000		42,000
Accrued employee benefits	80,000		43,000
	431,000		196,000
Other, including interest:
Warranty reserve	13,000		20,000
Property taxes	30,000		12,000
Deferred director compensation	96,000		52,000
Other	1,000		1,000
	140,000		85,000
	$	571,000	$	281,000