Note 18 - Commitments, Guarantees and Other Contingencies (Details) - Contractual Amounts of the Company’s Unused Lending Commitments (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Commitments to extend credit:
Unused lending commitments	$ 199,848
Single-family Real Estate, Revolving, Open-end Loans [Member]
Commitments to extend credit:
Unused lending commitments	70,643
Single Family Residential Construction Loan [Member]
Commitments to extend credit:
Unused lending commitments	10,805
Commercial Real Estate, Other Construction Loans, and Land Development Loan Commitments [Member]
Commitments to extend credit:
Unused lending commitments	33,392
Commercial and Industrial [Member]
Commitments to extend credit:
Unused lending commitments	42,377
Overdraft Protection Line [Member]
Commitments to extend credit:
Unused lending commitments	31,337
Other Loans [Member]
Commitments to extend credit:
Unused lending commitments	$ 11,294