XML 27 R27.htm IDEA: XBRL DOCUMENT v3.19.3
Note 6 - Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
September 30, 2019
    
December 31, 2018
  
                 
Lighting patent
   $
6,797,000
     $
6,797,000
  
Accumulated amortization
    
(1,309,838
 )    
(991,229
 )
                 
Net
   $
5,487,162
     $
5,805,771