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Note 12 - Revenue (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]
  

Year Ended December 31,

 

(In thousands)

 

2021

  

2022

  

2023

  

2024

  

Total

 

Rental revenue

 $6,070  $8,651  $722  $-  $15,443 

Service revenue

 $736  $31  $31  $10  $808