Significant Accounting Policies - Operating Lease Assets and Liabilities (Details) - USD ($)	Dec. 31, 2019	Dec. 25, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 20,410,037		$ 28,705,002
Current portion of operating lease liabilities	13,255,978		14,495,352
Operating lease liabilities	8,301,793		$ 16,027,764
Fair value below contract value of time charters acquired	$ 0			$ 1,818,114
Discount rate upon adoption	5.48%	2.806%
Increase to right-of-use asset	$ 4,500,000
Increase to lease liability	$ 4,500,000
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Discount rate upon adoption	5.05%
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Discount rate upon adoption	6.08%
Weighted Average
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Discount rate upon adoption	5.55%		2.806%
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets			$ 30,500,000
Fair value below contract value of time charters acquired			1,800,000
Chartered In Contracts
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 18,442,965		26,144,409
Current portion of operating lease liabilities	12,622,524		13,802,149
Operating lease liabilities	$ 6,974,943		14,160,374
Discount rate upon adoption	5.37%
Office Building
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 1,967,072		2,560,593
Current portion of operating lease liabilities	633,454		693,203
Operating lease liabilities	$ 1,326,850		$ 1,867,390
Discount rate upon adoption	5.80%