Consolidated Statement of Changes in Stockholders' Equity (Unaudited) (USD $)	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2011	$ 65,090	$ 4,879,435	$ 89,702,533	$ 44,585,902	$ 4,754,714	$ 2,051,538	$ (1,606,510)	$ 144,432,702
Net income				3,236,818		166,031		3,402,849
Comprehensive income					(1,517,235)			(1,517,235)
Preferred cash dividends declared and accrued				(938,625)				(938,625)
Proceeds from issuance of common stock as a result of stock purchased under the Employee Stock Purchase Plan		7,767	55,566					63,333
Proceeds from issuance of common stock as a result of stock options exercised		276	2,374					2,650
Stock compensation expense			326,245					326,245
Restricted stock awards		57,770	(57,770)
Other adjustments to noncontrolling interests						(2,066)		(2,066)
Exchange of shares of common stock in connection with payroll taxes for restricted stock		(576)	(2,103)					(2,679)
Balance at Mar. 31, 2012	65,090	4,944,672	90,026,845	46,884,095	3,237,479	2,215,503	(1,606,510)	145,767,174
Balance at Dec. 31, 2012	54,867	5,039,448	78,912,791	53,326,542	4,706,683		(1,606,510)	140,433,821
Net income				3,265,144				3,265,144
Comprehensive income					(836,358)			(836,358)
Preferred cash dividends declared and accrued				(810,837)				(810,837)
Proceeds from issuance of common stock as a result of stock purchased under the Employee Stock Purchase Plan		5,884	63,487					69,371
Proceeds from issuance of common stock as a result of stock options exercised		19,278	153,550					172,828
Exchange of 7,048 shares of common stock in connection with stock options exercised		(7,048)	(111,628)					(118,676)
Stock compensation expense			293,798					293,798
Tax benefit of nonqualified stock options exercised			35,251					35,251
Restricted stock awards		16,798	(16,798)
Exchange of shares of common stock in connection with payroll taxes for restricted stock		(16,798)	(289,113)					(305,911)
Balance at Mar. 31, 2013	$ 54,867	$ 5,057,562	$ 79,041,338	$ 55,780,849	$ 3,870,325		$ (1,606,510)	$ 142,198,431