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Note 4 - Debt and Equity Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Mutual Fund Debt Securities [Member]    
Amortized Cost $ 21,658,000 $ 21,290,000
Fair Value 21,658,000 21,290,000
Commercial Mortgage Backed Securities [Member]    
Amortized Cost 536,025,000  
Fair Value 545,067,000  
Due in one year or less 11,370,000  
Due in one year or less 11,370,000  
Due after one year through five years 40,000  
Due after one year through five years 40,000  
Due after ten years 21,864,000  
Due after ten years 22,000,000  
Amortized Cost 33,274,000 6,180,000
Fair Value 33,410,000 6,180,000
Due in one year or less  
Due in one year or less  
Due after one year through five years 1,795,000  
Due after one year through five years 1,821,000  
Due after five years through ten years 118,691,000  
Due after five years through ten years 117,707,000  
Due after ten years 224,034,000  
Due after ten years 224,626,000  
Total other securities 344,520,000  
Total other securities 344,154,000  
Amortized Cost 902,203,000 994,311,000
Fair Value $ 910,879,000 $ 993,397,000