Consolidated Statement of Stockholders Equity (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income tax benefit (expense), Post retirement benefits	$ (27,000)	$ (313,000)	$ (123,000)
Income tax benefit (expense), hedging activities	(62,000)	(140,000)
Foreign currency hedging derivatives
Income tax benefit (expense), hedging activities	98,000	(286,000)	87,000
Interest Rate Swaps
Income tax benefit (expense), hedging activities	$ (160,000)	$ 146,000	$ 15,000