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Sales, Contract Assets and Contract Liabilities
12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Revenue from Contract with Customer [Text Block]
Note 5 – Sales, Contract Assets and Contract Liabilities
 
During 2018, the Company recognized revenue totaling $
360,000
from completed flare projects, $
128,000
of revenue from completion of a once through steam generator (OTSG) project and revenue of $
42,000 
from a small project. To date, all of the Company’s sales have been Duplex products sold in the United States. At December 31, 2018, the Company had contract assets of 
$39,000 and contract liabilities of $0.