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Note 8 - Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
  

Commercial

  

Residential

  

Total

 

Three months ended March 31, 2022

  33%  67%  100%

Three months ended March 31, 2021

  30%  70%  100%