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Note 9 - Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Commercial
   
Residential
   
Total
 
Three months ended June 30, 2019
   
26
%    
74
%    
100
%
Three months ended June 30, 2018
   
26
%    
74
%    
100
%
Six months ended June 30, 2019
   
25
%    
75
%    
100
%
Six months ended June 30, 2018
   
27
%    
73
%    
100
%