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Sales, Contract Assets and Contract Liabilities
3 Months Ended
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]  
Revenue from Contract with Customer [Text Block]
Note 5 – Sales, Contract Assets and Contract Liabilities
 
The Company recognized no revenue during the three months ended March 31, 2019. For the three months ended March 31, 2018, the Company recognized revenues totaling $530,000 from completed flare projects. At March 31, 2019, the Company had contract assets of $39,000 and contract liabilities of $0. The cost of goods sold of $1,000, recognized during the three months ended March 31, 2019, related to additional warranty costs incurred for previously completed contracts.