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Note 8 - Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
2017
    
2016
  
                 
Lighting patent
   $
6,797,000
     $
6,797,000
  
Accumulated amortization
    
(566,417
 )    
(141,604
 )
                 
Net
   $
6,230,583
     $
6,655,396