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Note 1 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Estimated Useful Lives of Assets [Table Text Block]
Type
  
Estimated Useful Life (in years)
  
Buildings
  
15
to
45
  
Building improvements
  
5
to
20
  
Furniture, fixtures, and equipment
  
3
to
25
  
Leasehold improvements
  
Shorter of useful lives or the terms of the leases