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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Realized Gains on Marketable Securities [Member]        
Deferred income taxes $ 0 $ 0 $ 31,000 $ 0
Unrealized Losses on Marketable Securities [Member]        
Deferred income taxes 113,000 0 202,000 0
Changes in Fair Value of Marketable Securities [Member]        
Deferred income taxes 667,000 58,000 848,000 96,000
Deferred income taxes $ 2,414,000 $ 4,050,000 $ 4,197,000 $ 7,039,000