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Loans Payable - Note 7 - Monaco 2018 - Additional Information (Detail) - USD ($) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Jan. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2018 | Oct. 01, 2016
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate amount issuable |  |  |  |  |  | $ 3,000,000
Note 7 - Monaco 2018 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan amount borrowed |  |  |  |  | $ 1,000,000 |
Interest rate, stated percentage | 10.00% |  |  |  |  |
Agreement description | During the period ended March 31, 2018, Monaco advanced us $1.0 million that was included in a loan agreement that was executed on April 20, 2018. Monaco also agreed to treat $99,366 of back rent owed by us to Monaco as part of this loan resulting in an aggregate principal amount of $1,099,366 at March 31, 2021 and December 31, 2020. The indebtedness bears interest at 10.0% percent per year. During January 2021, this loan agreement was amended by increasing the interest rate to 18%, effective January 1, 2021. All principal and any unpaid interest are payable on the first anniversary of this agreement, April 20, 2019. This debt is secured by cash proceeds, if any, from our future shipwreck projects we have contracted with Magellan. As additional consideration, their share purchase option expiration date, as discussed in Note 1 – Monaco 2014 and Note 2 – Monaco 2016 above, has been extended from 30 days to seven months after the note becomes paid in full. For the three months ended March 31, 2021 and 2020, interest expense in the amount of $64,893 and $32,776, respectively, was recorded. |  |  |  |  |
Back rent considered as part of loan |  |  |  |  | $ 99,366,000,000 |
Aggregate amount issuable | $ 1,099,366 |  |  | $ 1,099,366 |  |
Accrued interest | $ 64,893 | $ 32,776 |  |  |  |
Interest rate, increased percentage |  |  | 18.00% |  |  |

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