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Note 1 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Year Ended December 31,
 
   
2019
   
2018
 
                 
Basic and diluted
   
19,201,663
     
19,091,679
 
Potentially dilutive
   
7,678
     
27,500