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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

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