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Note 3 - Marketable Equity Securities (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities $ 42,000 $ 709,000 $ 833,000
Trading Securities 0 0  
Accumulated Other Comprehensive Income (Loss), Net of Tax 7,444,000 7,476,000  
Available-for-Sale Securities Net Unrealized Holding Gain (Loss), Net of Tax 1,507,000 2,166,000  
Investment Income, Dividend 999,000 1,024,000 $ 1,058,000
Marketable Securities, Reclassification 0 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 2,980,000 1,340,000  
Available-for-sale Equity Securities, Gross Unrealized Loss 126,000 109,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0  
Trading Securities Pledged as Collateral $ 5,903,000 $ 10,358,000  
Debt, Weighted Average Interest Rate 2.07% 1.30%  
Available-for-sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 7,444,000 $ 7,476,000