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Loans Payable - Note 7 - Monaco 2018 - Additional Information (Detail) - Note 7 - Monaco 2018 [Member] - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Mar. 31, 2018
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 applied to 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 September 30, 2018. The indebtedness bears interest at 10.0% percent per year. All principal and any unpaid interest is to be 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 September 30, 2018, interest expense in the amount of $28,498 was recorded.  
Back rent considered as part of loan     $ 99,366
Aggregate amount issuable $ 1,099,366 $ 1,099,366  
Debt, interest expense $ 28,498