Customer Advances In Excess Of Costs Incurred On Contracts In Progress (Tables)

12 Months Ended

Dec. 31, 2019

Costs in Excess of Billings on Uncompleted Contracts or Programs [Abstract]

Schedule Of Customer Advances

	December 31,
	2019		2018
Contract liabilities	$	786,411	$	956,884
Less -
Contract liabilities presented under long-term liabilities	62,830		175,890
	$	723,581	$	780,994