Note 6 - Interest Rate Swap Derivatives - Offsetting of Derivative Liabilities (Details) - Interest Rate Swap [Member] - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Gross amounts of recognized liabilities	$ 463	$ 711
Gross amounts offset in the balance sheet		(19)
Net amounts of liabilities presented in the balance sheet	463	692
Gross amounts not offset in the balance sheet cash collateral posted		(550)
Gross amounts not offset in the balance sheet net amount	463	142
Counter Party 1 [Member]
Gross amounts of recognized liabilities	363	514
Gross amounts offset in the balance sheet		(19)
Net amounts of liabilities presented in the balance sheet	363	495
Gross amounts not offset in the balance sheet cash collateral posted		(380)
Gross amounts not offset in the balance sheet net amount	363	115
Counter Party 2 [Member]
Gross amounts of recognized liabilities	100	197
Gross amounts offset in the balance sheet
Net amounts of liabilities presented in the balance sheet	100	197
Gross amounts not offset in the balance sheet cash collateral posted		(170)
Gross amounts not offset in the balance sheet net amount	$ 100	$ 27