Note 5 - Term deposit (Detail)	Mar. 31, 2013
Time Deposits, Weighted Average Interest Rate, Maturities Year One	3.50%

Weighted average interest rate for time deposits held by the entity with maturities of one year or less.

No definition available.

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