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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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