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Leases - Lessee Accounting (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) item	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) item	Sep. 30, 2019 USD ($)
Real Estate in Greensboro, NC
Lessee Accounting
Operating lease, option to extend			true
Operating lease, remaining lease term	14 years 4 months 24 days		14 years 4 months 24 days
Operating lease expense | $	$ 121,000	$ 131,000	$ 383,000	$ 394,000
Real Estate in Greensboro, NC | Maximum
Lessee Accounting
Operating lease, number of renewal options | item	4		4
Real Estate in Greensboro, NC | Five-Year Lease
Lessee Accounting
Operating lease, renewal term	5 years		5 years
Real Estate in Greensboro, NC | Seven-Month Lease
Lessee Accounting
Operating lease, number of renewal options | item	1		1
Operating lease, renewal term	7 months		7 months
Corporate office lease in Great Neck, NY
Lessee Accounting
Operating lease, option to extend			true
Operating lease, remaining lease term	16 years 3 months 18 days		16 years 3 months 18 days
Operating lease expense | $	$ 14,000	$ 14,000	$ 42,000	$ 40,000
Corporate office lease in Great Neck, NY | Five-Year Lease
Lessee Accounting
Operating lease, renewal term	5 years		5 years

X

- Definition

The number of renewal options available to the Company, as defined in the lease agreement.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

Indicates (true false) whether lessee has option to extend operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977

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- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

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