Note 6 - Loans And Related Allowance For Loan Losses (Detail) - Troubled Debt Restructurings (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Commercial and Industrial [Member] | Three Months [Member]
Troubled debt restructurings number of contracts	1
Troubled debt restructurings pre-modification outstanding recorded investment (in Dollars)	$ 51
Commercial and Industrial [Member] | Six Months [Member]
Troubled debt restructurings number of contracts	7
Troubled debt restructurings pre-modification outstanding recorded investment (in Dollars)	229
Residential Real Estate Mortgage [Member] | Three Months [Member]
Troubled debt restructurings number of contracts	4
Troubled debt restructurings pre-modification outstanding recorded investment (in Dollars)	233
Residential Real Estate Mortgage [Member] | Six Months [Member]
Troubled debt restructurings number of contracts	7
Troubled debt restructurings pre-modification outstanding recorded investment (in Dollars)	327
Consumer Installment [Member] | Six Months [Member]
Troubled debt restructurings number of contracts	1
Troubled debt restructurings pre-modification outstanding recorded investment (in Dollars)	$ 5