Note 7 - Loans And Related Allowance For Loan Losses (Detail) - Troubled Debt Restructurings (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Rate Forgiveness [Member] | Commercial and Industrial [Member]
Number of contracts	4	3
Rate Forgiveness [Member] | Residential Real Estate Mortgage [Member]
Number of contracts	2	2
Rate Forgiveness [Member] | Commercial Real Estate Mortgage [Member]
Number of contracts	1
Rate Forgiveness [Member] | Consumer Installment [Member]
Number of contracts		1
Other Restructurings [Member] | Commercial and Industrial [Member]
Number of contracts	0	3
Other Restructurings [Member] | Residential Real Estate Mortgage [Member]
Number of contracts	1	2
Other Restructurings [Member] | Commercial Real Estate Mortgage [Member]
Number of contracts	0
Other Restructurings [Member] | Consumer Installment [Member]
Number of contracts		0
Commercial and Industrial [Member]
Number of contracts	4	6
Pre-modification outstanding recorded investment (in Dollars)	735	178
Residential Real Estate Mortgage [Member]
Number of contracts	3	4
Pre-modification outstanding recorded investment (in Dollars)	383	94
Commercial Real Estate Mortgage [Member]
Number of contracts	1
Pre-modification outstanding recorded investment (in Dollars)	644
Consumer Installment [Member]
Number of contracts		1
Pre-modification outstanding recorded investment (in Dollars)		5