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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Revenue Guidance, Financial Statements (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Consolidated Balance Sheets    
Advance hire, prepaid expenses and other current assets $ 12,187,551 $ 12,032,272
Total current assets 113,506,160 83,010,221
Total assets 453,474,622 423,297,088
Deferred revenue 14,717,072 5,815,924
Total current liabilities 79,048,628 70,010,153
Retained Earnings (Accumulated deficit) 5,737,199 (9,596,785)
Total liabilities and stockholders' equity 453,474,622 423,297,088
Consolidated Statements of Cash Flows    
Net income 23,981,646 9,100,655
Advance hire, prepaid expenses and other current assets 1,624,441 (1,368,584)
Deferred revenue 4,172,392 (607,058)
Consolidated Statements of Operations    
Revenues 372,970,373 385,945,564
Voyage expense 145,146,359 160,577,816
Charter hire expense 116,958,024 132,852,712
Operating Expenses 336,899,635 369,919,452
Operating Income (Loss) $ 36,070,738 $ 16,026,112
Basic (in dollars per share) $ 0.42 $ 0.20
Diluted (in dollars per share) $ 0.42 $ 0.20
As Reported    
Consolidated Balance Sheets    
Advance hire, prepaid expenses and other current assets $ 10,879,703  
Total current assets 112,198,312  
Total assets 452,166,774  
Deferred revenue 13,000,652  
Total current liabilities 77,332,208  
Retained Earnings (Accumulated deficit) 6,145,771  
Total liabilities and stockholders' equity 452,166,774  
Consolidated Statements of Cash Flows    
Net income 21,967,183  
Advance hire, prepaid expenses and other current assets 626,569  
Deferred revenue 7,184,727  
Consolidated Statements of Operations    
Revenues 369,958,038  
Voyage expense 145,008,444  
Charter hire expense 116,098,067  
Operating Expenses 335,901,763  
Operating Income (Loss) $ 34,056,275  
Basic (in dollars per share) $ 0.37  
Diluted (in dollars per share) $ 0.37  
Voyage revenue    
Consolidated Statements of Operations    
Revenues $ 319,753,056 $ 338,540,738
Voyage revenue | As Reported    
Consolidated Statements of Operations    
Revenues 316,740,721  
Retained Earnings (Accumulated Deficit)    
Consolidated Statements of Cash Flows    
Net income 17,757,020 $ 7,812,794
Retained Earnings (Accumulated Deficit) | As Reported    
Consolidated Statements of Cash Flows    
Net income 15,742,557  
Accounting Standards Update 2014-09 | Effect of ASC 606 Adoption    
Consolidated Balance Sheets    
Advance hire, prepaid expenses and other current assets 1,307,848  
Total current assets 1,307,848  
Total assets 1,307,848  
Deferred revenue 1,716,420  
Total current liabilities 1,716,420  
Retained Earnings (Accumulated deficit) (408,572)  
Total liabilities and stockholders' equity 1,307,848  
Consolidated Statements of Cash Flows    
Net income 2,014,463  
Advance hire, prepaid expenses and other current assets 997,872  
Deferred revenue (3,012,335)  
Consolidated Statements of Operations    
Revenues 3,012,335  
Voyage expense 137,915  
Charter hire expense 859,957  
Operating Expenses 997,872  
Operating Income (Loss) $ 2,014,463  
Basic (in dollars per share) $ 0.05  
Diluted (in dollars per share) $ 0.05  
Accounting Standards Update 2014-09 | Voyage revenue | Effect of ASC 606 Adoption    
Consolidated Statements of Operations    
Revenues $ 3,012,335  
Accounting Standards Update 2014-09 | Retained Earnings (Accumulated Deficit) | Effect of ASC 606 Adoption    
Consolidated Statements of Cash Flows    
Net income $ 2,014,463