Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)		9 Months Ended	12 Months Ended
	Jan. 03, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Significant Accounting Policies [Line Items]
Checks outstanding			$ 5,883,000	$ 4,071,000
Transfers into Level 2			0	0
Transfers out of Level 2			0	0
Proceeds from sale and maturity of available for sale securities			33,863,000	10,306,000	$ 22,959,000
Net unrealized losses included OCI			57,000	9,000	17,000
Contractual maturities of marketable securities, within one year			29,852,000
Contractual maturities of marketable securities, beyond one year to five years			14,601,000
Contractual maturities of marketable securities, beyond five years to ten years			5,117,000
Contractual maturities of marketable securities, beyond ten years			34,887,000
Goodwill			11,485,000	11,485,000
Goodwill, Cumulative Impairment Charges			0
Impairment of finite lived intangible assets					2,063,000
Gross carrying amount of intangibles			21,901,000
Accumulated amortization of intangibles			16,940,000	16,219,000
Amortization expense			721,000	5,173,000	11,991,000
Advertising expense			369,000	98,000	$ 202,000
Defense Products [Member]
Significant Accounting Policies [Line Items]
Construction in progress			3,461,000	8,928,000
Goodwill			$ 11,485,000	11,485,000
Housewares/ Small Appliances [Member]
Significant Accounting Policies [Line Items]
Construction in progress				3,100,000
Expected prepayment utilization period			2 years
Materials Prepayments			$ 10,974,000	16,254,000
Standard product warranty coverage period			60 days
Sales returns coverage period			60 days
Minimum [Member]
Significant Accounting Policies [Line Items]
Accounts receivable, collection period			25 days
Economic use period for intangibles			1 year
Minimum [Member] | Housewares/ Small Appliances [Member]
Significant Accounting Policies [Line Items]
Standard product warranty coverage period			1 year
Minimum [Member] | Buildings [Member]
Significant Accounting Policies [Line Items]
Useful life			15 years
Minimum [Member] | Machinery and Equipment [Member]
Significant Accounting Policies [Line Items]
Useful life			3 years
Minimum [Member] | Land Improvements [Member]
Significant Accounting Policies [Line Items]
Useful life			15 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Accounts receivable, collection period			60 days
Economic use period for intangibles			10 years
Maximum [Member] | Housewares/ Small Appliances [Member]
Significant Accounting Policies [Line Items]
Standard product warranty coverage period			12 years
Maximum [Member] | Buildings [Member]
Significant Accounting Policies [Line Items]
Useful life			40 years
Maximum [Member] | Machinery and Equipment [Member]
Significant Accounting Policies [Line Items]
Useful life			10 years
Maximum [Member] | Land Improvements [Member]
Significant Accounting Policies [Line Items]
Useful life			20 years
Maximum [Member] | Variable Rate Demand Notes [Member]
Significant Accounting Policies [Line Items]
Number of days to tender securites			7 days
Government Sales Contract Intangible Assets [Member]
Significant Accounting Policies [Line Items]
Gross carrying amount of intangibles			$ 21,690,000	21,690,000
Other Intangible Assets [Member]
Significant Accounting Policies [Line Items]
Gross carrying amount of intangibles			211,000
Other Current Assets [Member] | Housewares/ Small Appliances [Member]
Significant Accounting Policies [Line Items]
Materials Prepayments			$ 6,330,000	$ 6,000,000
Subsequent Event [Member]
Significant Accounting Policies [Line Items]
Proceeds from sale	$ 67,000,000
Subsequent Event [Member] | Scenario, Forecast [Member]
Significant Accounting Policies [Line Items]
Proceeds from sale		$ 4,000,000