Inventories (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Inventory [Line Items]
Liquidation of LIFO layer	$ 85,000	$ 26,000	$ 64,000
FIFO inventory amount	95,792,000	66,200,000
Finished goods	751,000	1,003,000
Work in process	87,805,000	59,580,000
Raw materials and supplies	7,236,000	5,617,000
Housewares/ Small Appliances [Member]
Inventory [Line Items]
LIFO inventory amount	32,744,000	27,788,000
Inventory valuation, difference below FIFO	$ 3,982,000	$ 4,024,000