CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) [Abstract]
Revenues	$ 60,320,000	$ 69,961,000	$ 125,524,000	$ 134,295,000
Operating Expenses:
Voyage Expenses	47,026,000	51,814,000	97,852,000	100,804,000
Vessel Depreciation	5,723,000	6,095,000	12,080,000	11,469,000
Administrative and General Expenses	4,720,000	5,455,000	10,228,000	11,284,000
Gain on Dry Bulk Transaction	0	(130,000)	0	(18,844,000)
Gain on Sale/Purchase of Other Assets	(667,000)	0	(4,466,000)	0
Total Operating Expenses	56,802,000	63,234,000	115,694,000	104,713,000
Operating Income	3,518,000	6,727,000	9,830,000	29,582,000
Interest and Other:
Interest Expense	2,281,000	2,330,000	5,008,000	4,620,000
Derivative Loss (Income)	117,000	106,000	(32,000)	(15,000)
Gain on Sale of Investment	(24,000)	(114,000)	(66,000)	(114,000)
Other Income from Vessel Financing	(605,000)	(672,000)	(1,227,000)	(1,360,000)
Investment Income	(146,000)	(185,000)	(274,000)	(385,000)
Foreign Exchange Loss (Gain)	1,734,000	1,900,000	(1,914,000)	411,000
Total Interest and Other Income	3,357,000	3,365,000	1,495,000	3,157,000
Aggregate earnings, including income adjustments	161,000	3,362,000	8,335,000	26,425,000
Provision for Income Taxes:
Current	108,000	173,000	276,000	381,000
Income Tax Expense (Benefit)	108,000	173,000	276,000	381,000
Equity in Net Income (Loss)of Unconsolidated Entities (Net of Applicable Taxes)	651,000	(351,000)	581,000	874,000
Net Income	$ 704,000	$ 2,838,000	$ 8,640,000	$ 26,918,000
Basic and Diluted Earnings Per Common Share:
Basic Earnings Per Common Share: (in dollars per share)	$ 0.10	$ 0.39	$ 1.20	$ 3.72
Diluted Earnings Per Common Share: (in dollars per share)	$ 0.10	$ 0.39	$ 1.20	$ 3.70
Weighted Average Shares of Common Stock Outstanding:
Basic (in shares)	7,203,860	7,228,252	7,187,236	7,230,530
Diluted (in shares)	7,234,505	7,265,092	7,202,559	7,260,598
Dividends Per Share (in dollars per share)	$ 0.250	$ 0.375	$ 0.500	$ 0.750