Note 18 - Disclosures About Fair Value - Fair Value of Mortgage Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Marketable securities, available-for-sale
Municipal debt securities	$ 9,771	$ 9,734
Fair Value, Inputs, Level 2 [Member]
Marketable securities, available-for-sale
Mortgage loans held for sale	173,568	328,835
Fair Value, Inputs, Level 3 [Member] | Metropolitan District Bond Securities [Member]
Marketable securities, available-for-sale
Municipal debt securities	8,711	$ 9,710
Municipal debt securities	$ 18,482