Note 10 - Derivative Financial Instruments and Hedging Transactions (Details Textual) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Other Income [Member] | Fair Value Hedging [Member] | |||
| Derivative, Net Hedge Ineffectiveness Gain (Loss) | $ 45,000 | $ (23,000) | $ (128,000) |