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Note 6 - Short-term Borrowings (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Line of Credit Facilities [Table Text Block]
Year ended December 31,
 
2015
 
 
2014
 
Maximum outstanding (month-end)
  $ --     $ --  
Outstanding at year-end
    --       --  
Interest rate at year-end
    6.0 %     6.0 %
Average interest rate
    6.0 %     6.0 %