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Note 5 - Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
Level 2
  March 31,
2020
  March 31,
2019
Liabilities:                
Derivative financial instruments   $
(624
)   $
(175
)