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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vessels, net (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 01, 2022
$ / item
Mar. 31, 2022
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
Dec. 31, 2021
$ / item
Vessels, net        
Estimated useful life   25 years    
Depreciation and amortization | $   $ 14,059 $ 13,441  
Estimated scrap value (in dollars per lightweight ton) | $ / item 400     310
Estimated life of average scrap value of steel 15 years      
Decrease in depreciation expense | $   $ 1,146    
Increase in basic net earnings per share   $ 0.03    
Increase in diluted net earnings per share   0.02    
Basic net earnings per share if no change to estimated scrap value   0.96    
Diluted net earnings per share if no change to estimated scrap value   $ 0.95    
Vessels        
Vessels, net        
Depreciation and amortization | $   $ 12,184 $ 11,769