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Note 1 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
2019
 
2018
 
2017
Average number of common shares outstanding
 
 
6,580,659
     
6,957,974
     
6,957,974