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Note 2 - Investment Securities (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) state item | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) state item | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) state item
Number of securities | item | 602 |  | 602 |  |
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions | item | 303 |  | 303 |  |
Aggregate losses of securities (as a percent) | 2.40% |  | 2.40% |  |
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | item | 42 |  | 42 |  |
Other than temporary impairment losses, investments | $ 0 | $ 0 | $ 0 | $ 0 |
General Obligation Bonds | Stockholders' Equity, Total [Member] | Credit Concentration Risk [Member] |  |  |  |  |
Concentration risk percentage (as a percent) |  |  | 0.00% |  | 0.00%
Revenue Bonds | Stockholders' Equity, Total [Member] | Credit Concentration Risk [Member] |  |  |  |  |
Concentration risk percentage (as a percent) |  |  | 0.00% |  | 0.00%
Municipal Bonds | General Obligation Bonds |  |  |  |  |
Number of issuers | item | 122 |  | 122 |  | 131
Other investments | $ 94,800 |  | $ 94,800 |  | $ 108,000
Number of states holding investments | state | 26 |  | 26 |  | 26
Municipal Bonds | General Obligation Bonds | Minimum |  |  |  |  |
Other investments | $ 5,000 |  | $ 5,000 |  | $ 5,000
Municipal Bonds | General Obligation Bonds | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |  |  |
Number of states holding investments | state | 6 |  | 6 |  | 6
Municipal Bonds | Revenue Bonds |  |  |  |  |
Number of issuers | item | 150 |  | 150 |  | 145
Other investments | $ 360,900 |  | $ 360,900 |  | $ 337,300
Number of states holding investments | 16 |  | 16 |  | 16
Municipal Bonds | Revenue Bonds | Minimum |  |  |  |  |
Other investments |  |  |  |  | $ 5,000
Municipal Bonds | Revenue Bonds | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |  |  |
Other investments | $ 5,000 |  | $ 5,000 |  |
Number of states holding investments | 7 |  | 7 |  | 7

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