Note 8 - Unused and Available Credit Balances of Financial Instruments Whose Contracts Represent Credit Risk (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financial Standby Letter of Credit [Member]
Financial instruments	$ 10,766	$ 18,316
Performance Guarantee [Member]
Financial instruments	1,443	1,358
Construction Mortgages [Member]
Financial instruments	16,043	21,144
Personal Line Of Credit [Member]
Financial instruments	5,970	5,810
Overdraft Protection Lines [Member]
Financial instruments	6,111	6,051
Home Equity Lines of Credit [Member]
Financial instruments	14,594	14,491
Commercial Lines Of Credit [Member]
Financial instruments	50,628	45,584
Financial instruments	$ 105,555	$ 112,754