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Pension and Other Postretirement Plans (Narrative) (Details) - USD ($)					3 Months Ended		6 Months Ended
	Sep. 13, 2017	Sep. 16, 2016	Dec. 02, 2015	Mar. 07, 2014	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Apr. 26, 2018	Apr. 28, 2011
Defined Benefit Plan Disclosure [Line Items]
Options granted
Granted and exercisable stock options					183,867	107,700	183,867	107,700
Shares underlying unexercised options					705,233	431,600	705,233	431,600
Expected future compensation expense, unexercised options					$ 1,200,000	$ 1,000,000	$ 1,200,000	$ 1,000,000
Expected future compensation expense, weighted average period for recognition							7 years	6 years 9 months 18 days
December 2, 2015 And March 7, 2014 [Member]
Defined Benefit Plan Disclosure [Line Items]
Vesting period							10 years
2018 Equity Incentive Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Shares authorized for issuance									1,000,000
2011 Stock Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Shares authorized for issuance										900,000
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Normal retirement age							65 years
Retirement benefit as percentage of compensation					75.00%		75.00%
Net periodic pension/postretirement cost (benefit)					$ 3,000	4,000	$ 6,000	$ 8,000
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension/postretirement cost (benefit)					$ (10,000)	$ 9,000	$ (20,000)	$ 18,000
Board Of Directors And Executive Officers [Member] | 2011 Stock Plan [Member] | September 13, 2017 [Member]
Defined Benefit Plan Disclosure [Line Items]
Options granted	350,000
Board Of Directors And Executive Officers [Member] | 2011 Stock Plan [Member] | September 16, 2016 [Member]
Defined Benefit Plan Disclosure [Line Items]
Options granted		160,000
Board Of Directors And Executive Officers [Member] | Tranche 1 - 10 [Member] | 2011 Stock Plan [Member] | September 16, 2016 [Member]
Defined Benefit Plan Disclosure [Line Items]
Vesting percentage		10.00%
Board Of Directors And Executive Officers [Member] | Tranche 1 - 3 [Member] | 2011 Stock Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Vesting percentage		33.00%
Directors [Member] | 2011 Stock Plan [Member] | December 2, 2015 [Member]
Defined Benefit Plan Disclosure [Line Items]
Options granted			120,000
Directors [Member] | 2011 Stock Plan [Member] | March 7, 2014 [Member]
Defined Benefit Plan Disclosure [Line Items]
Options granted				110,000
Directors [Member] | Tranche 1 - 10 [Member] | 2011 Stock Plan [Member] | September 13, 2017 [Member]
Defined Benefit Plan Disclosure [Line Items]
Vesting percentage	10.00%
Directors [Member] | Tranche 1 - 10 [Member] | 2011 Stock Plan [Member] | December 2, 2015 And March 7, 2014 [Member]
Defined Benefit Plan Disclosure [Line Items]
Vesting percentage							10.00%
Executive Officers [Member] | Tranche 1 - 5 [Member] | 2011 Stock Plan [Member] | September 13, 2017 [Member]
Defined Benefit Plan Disclosure [Line Items]
Vesting percentage	20.00%

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Retirement benefit as percentage of compensation.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
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Unrecognized cost of unvested options awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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