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Note 1 - Basis of Presentation and General Information (Details Textual)
 6 Months Ended
Sep. 16, 2022
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Shareholders Ownership, Percentage   54.00%    
Working Capital Deficit   $ 36,300,000    
Net Income (Loss) Attributable to Parent, Total   60,686,136 $ 11,736,326  
Net Cash Provided by (Used in) Operating Activities, Total   64,037,665 14,110,249  
Cash and Cash Equivalents, at Carrying Value, Total   4,952,773 $ 8,267,771 $ 26,530,944
Restricted Cash and Cash Equivalents, Total   $ 5,600,000    
Container Carriers Vessels [Member]        
Number of Vessels Under Construction   9    
Contractual Obligation, to be Paid, Year One   $ 100,600,000    
Contractual Obligation, to be Paid, Year Two   157,900,000    
Contractual Obligation, to be Paid, Year Three   56,700,000    
Debt Due February 2023 [Member]        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid   6,200,000    
Debt due May 2023 [Member]        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid   $ 6,000,000    
Loan Seccured By M/V Rena P and M/V Emmanuel P [Member] | Subsequent Event [Member]        
Proceeds from Issuance of Debt $ 19,250,000