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Note 1 - Organization and Operations (Details Textual)
Oct. 12, 2020
$ / shares
shares
Sep. 15, 2020
Jan. 03, 2022
Dec. 31, 2021
$ / shares
Dec. 31, 2020
$ / shares
Common Stock, Par or Stated Value Per Share (in dollars per share)       $ 0.01 $ 0.01
Subsequent Event [Member] | Momentum Fuel Technologies [Member]          
Equity Method Investment, Ownership Percentage     50.00%    
Common Class A [Member]          
Additional Share Issued for Every Two Shares of Common Stock (in shares) | shares 1        
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.01        
Common Class B [Member]          
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.01        
Stock Split From [Member]          
Stockholders' Equity Note, Stock Split, Conversion Ratio   3      
Stock Split To [Member]          
Stockholders' Equity Note, Stock Split, Conversion Ratio   2