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Note 6 - Intangible Assets (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
March 31,
2018
   
December 31,
2017
 
                 
Lighting patent
  $
6,797,000
    $
6,797,000
 
Accumulated amortization
   
(672,620
)    
(566,417
)
                 
Net
  $
6,124,380
    $
6,230,583