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Note 6 - Fair Value Methods Used for Measuring Fair Values of Financial Instruments on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Inputs, Level 1 [Member]        
Marketable equity securities (available-for-sale) $ 89,422 $ 103,694    
Fair Value, Inputs, Level 2 [Member]        
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage 82,193 115,670    
Fair Value, Inputs, Level 3 [Member] | Metropolitan District Bond Securities [Member]        
Metropolitan district bond securities (related party) (available-for-sale) 27,277 25,911    
Metropolitan District Bond Securities [Member]        
Metropolitan district bond securities (related party) (available-for-sale) $ 27,277 $ 25,911 $ 19,978 $ 18,203