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Note 5 - Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
March 31, 2020
    
December 31, 2019
  
                 
Lighting patent
   $
6,797,000
     $
6,797,000
  
Accumulated amortization
    
(1,522,244
 )    
(1,416,041
 )
                 
Net
   $
5,274,756
     $
5,380,959