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Note 7 - Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

2022

  

2021

 

Common stock equivalents of convertible promissory note and accrued interest

  29,235,002   6,758,897 

Warrants – other

  653,248   653,248 

Stock options

  293,670   386,461 

Total

  30,181,920   7,798,606