Note 14 - Change In Accounting Estimate (Detail) (USD $)	Sep. 30, 2012	Apr. 30, 2011
Property, Plant, and Equipment, Salvage Value (in Dollars)	$ 500
Property, Plant and Equipment, Salvage Value, Percentage		25.00%

Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentSalvageValuePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant