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Note 8 - Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
2018
   
2017
 
                 
Lighting patent
  $
6,797,000
    $
6,797,000
 
Accumulated amortization
   
(991,229
)    
(566,417
)
                 
Net
  $
5,805,771
    $
6,230,583