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Note 6 - Leases (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Lessee, Operating Lease, Supplemental Cash Flows Information [Table Text Block]
Supplemental Cash Flows Information, twelve months ended December 31   2020
     
Cash paid for amounts included in the measurement of operating lease liabilities   $
37,018
 
Right-of-use assets obtained in exchange for operating lease obligation   $
50,963
 
         
Weighted Average Remaining Operating Lease Term (years)    
5
 
Weighted Average Discount Rate    
3.7
%
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
     
2021   $
47,803
 
2022    
39,607
 
2023    
28,175
 
2024    
20,863
 
2025    
14,985
 
Thereafter    
29,984
 
Total future minimum lease payments    
181,417
 
Less imputed interest    
(17,309
)
Total    
164,108