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Income Taxes (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax liabilities (assets):    
Property, plant and equipment $ 11,532 $ 9,697
Patents and goodwill 1,775 1,756
Benefit plans (1,976) (2,131)
Inventories (420) (350)
Capital loss carryover (544) (556)
Other (179) (513)
Deferred tax liabilities (assets) 10,188 7,903
Plus: Valuation allowance 580 593
Total deferred tax liabilities $ 10,768 $ 8,496