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Note 6 - Short-term Borrowings (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Line of Credit Facilities [Table Text Block]
Year ended December 31,
 
2016
 
 
2015
 
Maximum outstanding (month-end)
  $
--
    $
--
 
Outstanding at year-end
   
--
     
--
 
Interest rate at year-end
   
--
     
6.0
%
Average interest rate
   
--
     
6.0
%