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

12 Months Ended

Dec. 31, 2020

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

Schedule Of Customer Advances

	December 31,
	2020		2019
Contract liabilities	$	1,169,232	$	786,411
Less -
Contract liabilities presented under long-term liabilities	169,073		62,830
	$	1,000,159	$	723,581