XML 60 R49.htm IDEA: XBRL DOCUMENT
v3.24.1.1.u2

Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Schedule of Investments (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Short-term Investments | $ 36,036,887 | $ 24,753,469
Short-term Investments | 36,036,887 | 24,753,469
U.S. Treasury Notes and Corporate Bonds [Member] |  |
Short-term Investments | 22,450,076 | 19,195,228
Short-term Investments | 22,450,076 | 19,195,228
Common Stock Warrants of Sky Harbour Group Corporation [Member] |  |
Short-term Investments | 13,586,811 | 5,558,241
Short-term Investments | $ 13,586,811 | $ 5,558,241

X
- Definition Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_ShortTermInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_InvestmentTypeAxis=boc_USTreasuryNotesAndCorporateBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=boc_CommonStockWarrantsOfSkyHarbourGroupCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |