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Note 2 - Investment Securities (Detail) - Amortized Cost and Fair Value of Securities by Contractual Maturity (USD $)
Dec. 31, 2012
Securities held to maturity:  
Due in one year or less $ 853,965
Due in one year or less 858,014
Due after one year through five years 9,801,254
Due after one year through five years 9,813,395
Due after five years 61,424,166
Due after five years 62,334,297
72,079,385
73,005,706
Securities available for sale:  
Due in one year or less 995,005
Due in one year or less 995,917
Due after one year through five years 33,202,789
Due after one year through five years 33,663,178
Due after five years 326,967,416
Due after five years 330,275,412
361,165,210
364,934,507
Securities with no stated maturity date, amortized cost 522,547,519
Securities with no stated maturity date, fair value 530,159,986
Callable Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
 
Securities available for sale:  
Securities with no stated maturity date, amortized cost 13,498,939
Securities with no stated maturity date, fair value 14,381,300
Municipal securities, held to maturity 46,672,253
Municipal securities, held to maturity 47,157,578
Callable Securities [Member] | US Government-sponsored Enterprises Debt Securities [Member]
 
Securities available for sale:  
Securities with no stated maturity date, amortized cost 304,670,224
Securities with no stated maturity date, fair value 306,253,738
Callable Securities [Member]
 
Securities available for sale:  
Securities with no stated maturity date, amortized cost 318,169,163
Securities with no stated maturity date, fair value 320,635,038
Residential Mortgage Backed Securities [Member]
 
Securities available for sale:  
Securities with no stated maturity date, amortized cost 160,035,196
Securities with no stated maturity date, fair value 163,601,103
Equity Securities, Other [Member]
 
Securities available for sale:  
Securities with no stated maturity date, amortized cost 1,347,113
Securities with no stated maturity date, fair value $ 1,624,376