Note 14 - Supplemental Cash Flow Information (Details Textual) - USD ($) $ in Thousands  | 
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020  | 
Dec. 31, 2019  | 
Dec. 31, 2018  | 
|
| Interest Costs Capitalized Adjustment | $ 0 | $ 0 | $ 0 | 
| X | ||||||||||
- Definition Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred. No definition available. 
  |