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Note 1 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
2020
   
2019
   
2018
 
Basic
   
3,270,996
     
3,270,878
     
3,268,667
 
Diluted
   
3,306,503
     
3,277,198
     
3,269,834