Investments (Unrealized Gain (Loss) On Investments) (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Unrealized Gains	$ 33,437,210	$ 33,553,253
Unrealized Losses	(385,324)	(91,712)
Cost [Member]
Investments	133,749,723	182,077,222
Cost [Member] | Government Securities [Member]
Investments	24,058,998	36,137,467
Cost [Member] | U.S. Treasury Notes [Member]
Investments		50,095,921
Cost [Member] | Other [Member]
Investments	62,413	154,586
Cost [Member] | Common Stocks [Member]
Investments	45,309,491	44,899,944
Cost [Member] | Mutual Funds - Equity [Member]
Investments	55,701,057	42,106,776
Cost [Member] | Limited Partnership - Equity [Member]
Investments	7,779,258	7,844,022
Cost [Member] | Certificate Of Deposit [Member]
Investments	500,000	500,000
Cost [Member] | Other - Equity [Member]
Investments	338,506	338,506
Government Securities [Member]
Investments	24,054,390	36,136,760
Unrealized Gains	4,731	9,254
Unrealized Losses	(9,339)	(9,961)
U.S. Treasury Notes [Member]
Investments		50,156,250
Unrealized Gains		60,329
Other [Member]
Investments	62,413	154,586
Market Value [Member]
Investments	166,801,609	215,538,763
Common Stocks [Member]
Investments	61,706,850	63,637,711
Unrealized Gains	16,660,519	18,819,518
Unrealized Losses	(263,160)	(81,751)
Mutual Funds - Equity [Member]
Investments	71,062,101	55,234,901
Unrealized Gains	15,473,869	13,128,125
Unrealized Losses	(112,825)
Limited Partnership - Equity [Member]
Investments	9,059,455	9,363,555
Unrealized Gains	1,280,197	1,519,533
Certificate Of Deposit [Member]
Investments	500,000	500,000
Other - Equity [Member]
Investments	356,400	355,000
Unrealized Gains	$ 17,894	$ 16,494