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Note 5 - Investments Net Unrealized Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Gain (Loss) on Investments [Line Items]        
Unrealized Gain (Loss) on Securities [1] $ (5,577) $ 5,913 $ (17,503) $ 7,979
Trading Securities, Change in Unrealized Holding Gain (Loss) [2] (5,733) 6,938 (18,537) 12,164
Equity Securities [Member]        
Gain (Loss) on Investments [Line Items]        
Equity Securities, Change in Unrealized Holding Gain (Loss) [1] 224 0 (702) 0
Trading Securities [Member]        
Gain (Loss) on Investments [Line Items]        
Trading Securities, Change in Unrealized Holding Gain (Loss) [1],[3] $ (5,801) $ 5,913 $ (16,801) $ 7,979
[1] Related only to securities still held at period end. All amounts shown are included in net gains (losses) on investments and other financial instruments. Prior to the implementation of the update to the standard for the accounting of financial instruments effective January 1, 2018, the unrealized losses associated with equity securities were classified in accumulated other comprehensive income.
[2] These amounts include unrealized gains (losses) on investment securities other than securities available for sale. For the three and six months ended June 30, 2017, the unrealized gains (losses) on investments exclude the net change in unrealized gains and losses on equity securities. Prior to the implementation of the update to the standard for the accounting of financial instruments effective January 1, 2018, the unrealized gains (losses) associated with equity securities were classified in accumulated other comprehensive income.
[3] Includes a de minimis amount of net changes in unrealized gains (losses) related to short-term securities.