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Sales, Contract Assets and Contract Liabilities (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Contract with Customer, Asset, Net, Current	$ 39,000	$ 184,000
Contract with Customer, Liability, Current	0
Once Through Steam Generator [Member]
Revenue from Contract with Customer, Including Assessed Tax	128,000
Small Project [Member]
Revenue from Contract with Customer, Including Assessed Tax	42,000
California oil producer [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 360,000

X

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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