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Investment in Unconsolidated Joint Venture - Narrative (Detail)		1 Months Ended			3 Months Ended						9 Months Ended
	Feb. 01, 2021 USD ($)	Sep. 30, 2020 USD ($)	May 31, 2020 USD ($)	Feb. 29, 2020 USD ($)	Jan. 31, 2021 USD ($)	Nov. 01, 2020 USD ($)	Aug. 02, 2020 USD ($)	Feb. 02, 2020 USD ($)	Nov. 03, 2019 USD ($)	Aug. 04, 2019 USD ($)	Jan. 31, 2021 USD ($)	Feb. 02, 2020 USD ($)	May 03, 2020 USD ($)		Dec. 20, 2019 USD ($) ft²	Jan. 01, 2017 ft²
Equity Method Investments And Joint Ventures [Abstract]
Net income (loss)					$ 2,082,000	$ 2,384,000	$ (2,733,000)	$ (4,207,000)	$ 2,192,000	$ 1,174,000	$ 1,733,000	$ (841,000)
Income (loss) from investment in unconsolidated joint venture					(136,000)			(56,000)			31,000	(59,000)
Investment in unconsolidated joint venture					$ 1,723,000			1,668,000			$ 1,723,000	1,668,000	$ 1,602,000	[1]
CIH [Member]
Equity Method Investments And Joint Ventures [Abstract]
Equity method investment, ownership percentage					50.00%						50.00%					50.00%
Area of additional plant facility | ft²															40,000	80,000
Contractual obligation															$ 1,200,000
Payments to acquire additional plant facility		$ 420,000	$ 180,000	$ 600,000
Income (loss) from investment in unconsolidated joint venture											$ 31,000	(59,000)
Investment in unconsolidated joint venture					$ 1,700,000			$ 1,700,000			1,700,000	1,700,000	$ 1,600,000
CIH [Member] | Subsequent Event [Member]
Schedule of Ownership Changes [Abstract]
Acquisition of additional ownership percentage	50.00%
Payments to acquire additional ownership interest	$ 948,000
CIH [Member] | Equity Method Investment Nonconsolidated Investee Or Group of Investees [Member]
Equity Method Investments And Joint Ventures [Abstract]
Net income (loss)											$ 62,000	$ (120,000)
[1] Derived from audited financial statements.

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