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Consolidated Statements of Operations (Parentheticals) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Commissions, related party $ 493,341 $ 453,361 $ 310,467
Vessel operating expenses, related party 249,081 256,069 190,723
Other general and administrative expenses, related party 1,344,250 1,561,126 1,306,476
Net gain on sale of vessels, related party 0 64,500 70,640
Interest and other financing costs, related party $ 84,444 $ 0 $ 0