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Note 6 - Intangible Assets (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
June 30, 2019
   
December 31, 2018
 
                 
Lighting patent
  $
6,797,000
    $
6,797,000
 
Accumulated amortization
   
(1,203,635
)    
(991,229
)
                 
Net
  $
5,593,365
    $
5,805,771