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Loans Payable - Note 7 - Monaco 2018 - Additional Information (Detail) - Note 7 - Monaco 2018 [Member] - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 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 subsequent to March 31, 2018. The indebtedness is to bear interest at 10.0% percent per year. All principal and any unpaid interest is to be payable on the first anniversary of this agreement. This debt is to be secured by future cash proceeds from our 21.25% cash proceeds, if any, from future shipwreck projects we have contracted with Magellan. As additional consideration, their share purchase option, as discussed in Note 1 – Monaco 2014 and Note 2 – Monaco 2016 above, extension has been extended to six months from 30 days in the event that note becomes paid in full which is when the extension begins  
Back rent considered as part of loan     $ 99,366
Aggregate amount issuable     $ 1,099,366
Debt, interest expense $ 21,818