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Note 3 - Marketable Equity Securities (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities $ 709,000 $ 833,000 $ 1,000
Trading Securities 0 0  
Accumulated Other Comprehensive Income (Loss), Net of Tax 7,476,000 5,310,000  
Available-for-Sale Securities Net Unrealized Holding Gain (Loss), Net of Tax 2,166,000 1,092,000  
Investment Income, Dividend 1,024,000 1,058,000 $ 896,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,340,000 5,099,000  
Available-for-sale Equity Securities, Gross Unrealized Loss 109,000 1,333,000  
Trading Securities Pledged as Collateral $ 10,358,000 $ 11,949,000  
Debt, Weighted Average Interest Rate 1.30% 0.94%  
Marketable Securities, Reclassification $ 0    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 $ 0  
Available-for-sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 7,476,000 $ 5,310,000