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Note 8 - Investment in Limited Partnership (Details Textual) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 99.90%  
Maximum [Member]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets, Total $ 0.1 $ 0.1