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Related Party Transactions (Tables)
12 Months Ended
Dec. 31, 2020
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
Amounts and notes payable to related parties consist of the following:

December 31, 2019ActivityDecember 31, 2020
Included in trade accounts receivable and voyage revenue on the consolidated balance sheets and statements of income, respectively:
Trade receivables due from King George Slag(i)
$457,629 $(350,670) $106,959 
Included in accounts payable and accrued expenses on the consolidated balance sheets:    
Trade payables due to Seamar (ii)
$5,679,768 $(1,528,576) $4,151,192 
Included in current related party notes payable on the consolidated balance sheets:  
Interest payable – 2011 Founders Note332,987 (90,135) 242,852 
Promissory Note— —   
Total current related party notes payable $332,987 $(90,135)$242,852 
 

i.King George Slag LLC is a joint venture of which the Company owns 25%.
ii.Seamar Management S.A. ("Seamar")