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Note 16 - Financial Derivatives (Details Textual) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2014 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Junior Subordinated Notes, Total | $ 119,100 |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  | $ (2,102) | $ 736 | $ (3,326) | $ 2,929 |
Cash [Member] |  |  |  |  |  |
Collateral Already Posted, Aggregate Fair Value |  | 6,900 |  | 6,900 |  | $ 1,800
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative Outstanding, Notional Amount | $ 119,100 | 119,100 |  | 119,100 |  | 119,100
Derivative Original Maturity | 10 years |  |  |  |  |
Derivative, Average Fixed Interest Rate | 2.61% |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  |  | 3,600 |  | 241
Net Accrued on Interest Rate Swaps |  | $ 8 | 123 | $ 37 | 396 |
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Derivative, Average Variable Interest Rate |  | 2.50% |  | 2.50% |  |
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative Outstanding, Notional Amount |  | $ 570,800 |  | $ 570,800 |  | 613,400
Derivative, Average Fixed Interest Rate |  | 4.72% |  | 4.72% |  |
Derivative, Average Variable Interest Rate |  | 5.10% |  | 5.10% |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  |  | $ 7,300 |  | 6,600
Net Accrued on Interest Rate Swaps |  | $ 534 | $ 0 | $ 1,100 | $ (229) |
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Minimum [Member] |  |  |  |  |  |
Derivative Original Maturity |  |  |  | 3 years |  |
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Maximum [Member] |  |  |  |  |  |
Derivative Original Maturity |  |  |  | 10 years |  |
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Derivative, Average Variable Interest Rate |  | 2.62% |  | 2.62% |  |
Negative Fair Value [Member] |  |  |  |  |  |
Notional Amount Of Option Contract |  | $ 1,700 |  | $ 1,700 |  | 1,200
Open Option Contracts Fair Value |  | 14 |  | 14 |  | 6
Sum Of Spot And Forward Contract Notional Amount |  | 95,600 |  | 95,600 |  | 95,000
Negative Fair Value |  | 876 |  | 876 |  | 1,800
Positive Fair Value [Member] |  |  |  |  |  |
Sum Of Spot And Forward Contract Notional Amount |  | 109,700 |  | 109,700 |  | 86,900
Positive Fair Value |  | $ 638 |  | $ 638 |  | $ 397

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)(a)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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