Summary Of Significant Accounting And Reporting Policies (Schedule Of Amortized Cost, Unrealized Gains And Losses, And Market Value Of Investment Securities) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 179,388,001	$ 172,957,560
Unrealized Gains	23,937,617	18,597,832
Unrealized Losses	(688,728)	(2,578,990)
Market Value	202,636,890	188,976,402
Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	38,514,411	35,016,980
Unrealized Gains	9,004	7,090
Unrealized Losses	(944)	(40)
Market Value	38,522,471	35,024,030
U.S. Treasury Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	15,018,810	25,025,600
Unrealized Gains	2,602	18,400
Unrealized Losses	(1,062)
Market Value	15,020,350	25,044,000
Corporate Bonds, Short-Term [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	6,529,758	648,879
Unrealized Gains	33,470	325
Market Value	6,563,228	649,204
Corporate Bond, Long-Term [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	2,174,948
Unrealized Gains	5,832
Market Value	2,180,780
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	185,926	91,003
Market Value	185,926	91,003
Common Stocks [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	40,893,121	42,344,526
Unrealized Gains	12,781,501	12,274,640
Unrealized Losses	(391,421)	(1,064,863)
Market Value	53,283,201	53,554,303
Mutual Funds - Equity [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	75,321,640	68,986,676
Unrealized Gains	11,082,714	6,277,183
Unrealized Losses	(295,301)	(1,514,087)
Market Value	86,109,053	73,749,772
Certificate Of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	510,881	505,390
Market Value	510,881	505,390
Other - Equity [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	238,506	338,506
Unrealized Gains	22,494	20,194
Market Value	$ 261,000	$ 358,700