Statement of Shareholders' Equity (USD $)	3 Months Ended
	Mar. 31, 2012
Balance, beginning of year	$ 75,785,048
Issued during year	0
Treasury shares acquired and retired	(433,177)
Net income attributable to common shareholders	10,453,034
Unrealized holding income (loss) on securities net of noncontrolling and reclassification adjustment and taxes	(6,403,275)
Contributions	0
Distributions	(10,000)
Gain attributable to noncontrolling interest	273,214
Balance, end of period	74,438,327
Common Stock [Member]
Issued during year	0
Treasury shares acquired and retired	(36)
Net income attributable to common shareholders	0
Unrealized holding income (loss) on securities net of noncontrolling and reclassification adjustment and taxes	0
Contributions	0
Distributions	0
Gain attributable to noncontrolling interest	0
Additional Paid-in Capital [Member]
Issued during year	0
Treasury shares acquired and retired	(433,141)
Net income attributable to common shareholders	0
Unrealized holding income (loss) on securities net of noncontrolling and reclassification adjustment and taxes	0
Contributions	0
Distributions	0
Gain attributable to noncontrolling interest	0
Retained Earnings [Member]
Issued during year	0
Treasury shares acquired and retired	0
Net income attributable to common shareholders	5,226,517
Unrealized holding income (loss) on securities net of noncontrolling and reclassification adjustment and taxes	0
Contributions	0
Distributions	0
Gain attributable to noncontrolling interest	0
Accumulated Other Comprehensive Income (Loss) [Member]
Issued during year	0
Treasury shares acquired and retired	0
Net income attributable to common shareholders	0
Unrealized holding income (loss) on securities net of noncontrolling and reclassification adjustment and taxes	(6,403,275)
Contributions	0
Distributions	0
Gain attributable to noncontrolling interest	0
Noncontrolling Interest [Member]
Issued during year	0
Treasury shares acquired and retired	0
Net income attributable to common shareholders	0
Unrealized holding income (loss) on securities net of noncontrolling and reclassification adjustment and taxes	0
Contributions	0
Distributions	(10,000)
Gain attributable to noncontrolling interest	$ 273,214