Consolidated Statements of Other Comprehensive Income (Loss) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Consolidated Statements of Other Comprehensive Income (Loss)
Net income (loss)	$ 8,165,000	$ (15,223,000)	$ (4,782,000)
Foreign currency hedging derivatives & Interest rate swaps:
Income tax benefit (expense)	(62,000)	(140,000)
Post retirement benefit plan adjustments:
Net actuarial gain (loss)	283,000	(985,000)	1,081,000
Prior service costs	(496,000)	(496,000)	(496,000)
Income tax benefit (expense), Post retirement benefits	(27,000)	(313,000)	(123,000)
Comprehensive income (loss)	8,170,000	(15,970,000)	(4,735,000)
Foreign currency hedging derivatives
Foreign currency hedging derivatives & Interest rate swaps:
Unrealized benefit (loss)	(452,000)	1,202,000	(452,000)
Income tax benefit (expense)	98,000	(286,000)	87,000
Interest Rate Swaps
Foreign currency hedging derivatives & Interest rate swaps:
Unrealized benefit (loss)	705,000	(641,000)	(65,000)
Income tax benefit (expense)	$ (160,000)	$ 146,000	$ 15,000