Note 12 - Derivative Financial Instruments - Effect of Master Netting Arrangements on Derivative Assets and Liabilities in the Consolidated Statements of Condition (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Interest Rate Swap [Member]
Interest Rate Swaps, Gross Amount of Recognized Assets		$ 48,000
Interest Rate Swaps, Gross Amount Offset in the Statement of Condition		0
Interest Rate Swaps, Net Amount of Assets Presented in the Statement of Condition		48,000
Interest Rate Swaps, Financial Instruments		48,000
Interest Rate Swaps, Cash Collateral Received		0
Derivative Asset		0
Interest Rate Swaps, Gross Amount of Recognized Liabilities	$ 15,426,000	4,314,000
Interest Rate Swaps, Gross Amount Offset in the Statement of Condition
Interest Rate Swaps, Net Amount of Liabilities Presented in the Statement of Condition	15,426,000	4,314,000
Interest Rate Swaps, Financial Instruments		48,000
Interest Rate Swaps, Cash Collateral Pledged	15,426,000	4,266,000
Interest Rate Swaps, Net Amount
Derivative Asset	$ 0