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Significant Accounting Policies and Recent Accounting Pronouncements (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accounting Policies Disclosure [Line Items]      
Accounts receivable, provision for doubtful accounts $ 0 $ 0  
Time period for measurement of time charter rate, input for calculation of vessel impairments 10 years    
Provision for Doubtful Accounts $ 0 0 $ 133,000
Accrued interest income 605,000 1,206,000  
Management fees to a related party (Note 4(a)) $ 1,332,000 $ 1,313,000 $ 511,000
Earnings Per Share Basic $ 0.06 $ 0.44 $ 1.42
Earnings Per Share Diluted $ 0.05 $ 0.42 $ 1.36
Time deposits $ 63,500,000 $ 40,000,000  
Maturities of time deposits 40,000,000 56,500,000  
Short-term investment placements 63,500,000 50,000,000  
Credit loss recorded $ 0 0  
Salvage Value [Member]      
Accounting Policies Disclosure [Line Items]      
Change In Accounting Estimate Description Effective July 1, 2023, the Company reassessed the estimated scrap rate used to calculate depreciation and, based on the average demolition prices in different markets during the last 15 years, adjusted upwards the estimated scrap rate of its vessels. This change in estimate    
Net income   $ 3,773,000  
Earnings Per Share Basic   $ 0.04  
Earnings Per Share Diluted   $ 0.04  
Impaired Vessels      
Accounting Policies Disclosure [Line Items]      
Impairment $ 0 $ 0 $ 0
Impaired Building      
Accounting Policies Disclosure [Line Items]      
Impairment 0 $ 0 $ 0
Building [Member]      
Accounting Policies Disclosure [Line Items]      
Property and equipment, estimated useful lives   55 years  
Property and equipment, residual value $ 0    
Furniture [Member]      
Accounting Policies Disclosure [Line Items]      
Property and equipment, estimated useful lives   5 years  
Office Equipment [Member]      
Accounting Policies Disclosure [Line Items]      
Property and equipment, estimated useful lives   5 years  
Vehicles [Member]      
Accounting Policies Disclosure [Line Items]      
Property and equipment, estimated useful lives   5 years  
Car [Member]      
Accounting Policies Disclosure [Line Items]      
Property and equipment, estimated useful lives   10 years  
Computer Software and Hardware [Member]      
Accounting Policies Disclosure [Line Items]      
Property and equipment, estimated useful lives   3 years  
Vessels [Member]      
Accounting Policies Disclosure [Line Items]      
Property and equipment, estimated useful lives 25 years