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Note 6 - Fair Value Measurements - Fair Value Methods Used for Measuring Fair Values of Financial Instruments on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Inputs, Level 1 [Member]            
Marketable equity securities (available-for-sale) $ 79,221   $ 103,694      
Fair Value, Inputs, Level 2 [Member]            
Mortgage loans held-for-sale, net 117,989   115,670      
Fair Value, Inputs, Level 3 [Member] | Metropolitan District Bond Securities [Member]            
Metropolitan district bond securities (related party) (available-for-sale) 29,132   25,911      
Metropolitan District Bond Securities [Member]            
Metropolitan district bond securities (related party) (available-for-sale) $ 29,132 $ 28,604 $ 25,911 $ 24,074 $ 22,259 $ 18,203