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Note 4 - Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
Level 2
  June 30,
2019
  December 31,
2018
(Liabilities) Assets:                
Derivative financial instruments   $
(373
)   $
64