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Note 5 - Disposition Activities (Details Textual) | May 11, 2020 USD ($) a | Dec. 07, 2019 USD ($) a | Aug. 27, 2019 USD ($) a
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Flowerfield Complex in Smithtown, New York [Member] |  |  |
Area of Land (Acre) | a |  |  | 9
Flowerfield Complex in Smithtown, New York [Member] | BSL St. James LLC [Member] |  |  |
Proceeds from Sale of Property, Plant, and Equipment, Total |  |  | $ 16,800,000
Cortlandt Manor Property In New York [Member] |  |  |
Area of Land (Acre) | a |  | 4.5 |
Proceeds from Sale of Property, Plant, and Equipment, Total |  | $ 5,720,000 |
Sale of Vacant Land [Member] |  |  |
Area of Real Estate Property (Square Foot) | a | 5 |  |
Sale of Real Estate Property, Purchase Price | $ 500,000 |  |
Proceeds from Sale of Real Estate, Total | 25,000 |  |
Sale of Real Estate Property, Amount Receivable | $ 475,000 |  |

X
- Definition The amount of receivable generated from the sale of real estate property. + References No definition available. + Details
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Namespace Prefix: | gyro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The purchase price of the real estate property. + References No definition available. + Details
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Namespace Prefix: | gyro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Area of land held. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

X
- Definition Area of a real estate property. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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X
- Definition Cash received for the sale of real estate that is not part of an investing activity during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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- Details
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- Details
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- Details
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X
- Details
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