Note 4 - Loans and Allowance for Loan Losses (Details) - Impaired loans, net of government guarantess and excluding loans acquired, segregated by class of loans: (USD $)	3 Months Ended	6 Months Ended				6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended		6 Months Ended				6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended		6 Months Ended				6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended		6 Months Ended			12 Months Ended			12 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Consumer Loans [Member]	Dec. 31, 2012 Consumer Loans [Member]	Jun. 30, 2013 Consumer Loans [Member]	Dec. 31, 2012 Consumer Loans [Member]	Jun. 30, 2013 Consumer Loans [Member]	Dec. 31, 2012 Consumer Loans [Member]	Jun. 30, 2013 Credit Cards [Member]	Dec. 31, 2012 Credit Cards [Member]	Jun. 30, 2013 Credit Cards [Member]	Dec. 31, 2012 Credit Cards [Member]	Jun. 30, 2013 Credit Cards [Member]	Dec. 31, 2012 Credit Cards [Member]	Jun. 30, 2013 Other Consumer [Member]	Dec. 31, 2012 Other Consumer [Member]	Jun. 30, 2013 Other Consumer [Member]	Dec. 31, 2012 Other Consumer [Member]	Jun. 30, 2013 Other Consumer [Member]	Dec. 31, 2012 Other Consumer [Member]	Jun. 30, 2013 Real Estate Loans [Member]	Dec. 31, 2012 Real Estate Loans [Member]	Jun. 30, 2013 Real Estate Loans [Member]	Dec. 31, 2012 Real Estate Loans [Member]	Jun. 30, 2013 Real Estate Loans [Member]	Dec. 31, 2012 Real Estate Loans [Member]	Jun. 30, 2013 Construction Loans [Member]	Dec. 31, 2012 Construction Loans [Member]	Jun. 30, 2013 Construction Loans [Member]	Dec. 31, 2012 Construction Loans [Member]	Jun. 30, 2013 Construction Loans [Member]	Dec. 31, 2012 Construction Loans [Member]	Jun. 30, 2013 Single Family Residential Loans [Member]	Dec. 31, 2012 Single Family Residential Loans [Member]	Jun. 30, 2013 Single Family Residential Loans [Member]	Dec. 31, 2012 Single Family Residential Loans [Member]	Jun. 30, 2013 Single Family Residential Loans [Member]	Dec. 31, 2012 Single Family Residential Loans [Member]	Jun. 30, 2013 Other Commercial Real Estate Loans [Member]	Jun. 30, 2013 Other Commercial Real Estate Loans [Member]	Jun. 30, 2013 Other Commercial Real Estate Loans [Member]	Jun. 30, 2013 Commercial Loans [Member]	Dec. 31, 2012 Commercial Loans [Member]	Jun. 30, 2013 Commercial Loans [Member]	Dec. 31, 2012 Commercial Loans [Member]	Jun. 30, 2013 Commercial Loans [Member]	Dec. 31, 2012 Commercial Loans [Member]	Jun. 30, 2013 Commercial [Member]	Jun. 30, 2013 Commercial [Member]	Jun. 30, 2013 Commercial [Member]	Jun. 30, 2013 Agricultural Loans [Member]	Dec. 31, 2012 Agricultural Loans [Member]	Jun. 30, 2013 Agricultural Loans [Member]	Dec. 31, 2012 Agricultural Loans [Member]	Jun. 30, 2013 Agricultural Loans [Member]	Dec. 31, 2012 Agricultural Loans [Member]	Jun. 30, 2013 Impaired Loans Net Of Government Guarantees And Excluding Loans Acquired [Member]	Jun. 30, 2013 Impaired Loans Net Of Government Guarantees And Excluding Loans Acquired [Member]	Jun. 30, 2013 Impaired Loans Net Of Government Guarantees And Excluding Loans Acquired [Member]	Dec. 31, 2012 Other Commercial Loans [Member]	Dec. 31, 2012 Other Commercial Loans [Member]	Dec. 31, 2012 Other Commercial Loans [Member]	Dec. 31, 2012 Total Commercial Loans [Member]	Dec. 31, 2012 Total Commercial Loans [Member]	Dec. 31, 2012 Total Commercial Loans [Member]	Dec. 31, 2012	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance			$ 33,498,000	$ 1,537,000	$ 1,687,000					$ 507,000	$ 547,000					$ 1,030,000	$ 1,140,000					$ 15,702,000	$ 30,733,000					$ 3,272,000	$ 5,443,000					$ 3,145,000	$ 4,091,000					$ 9,285,000			$ 811,000	$ 842,000					$ 724,000			$ 87,000	$ 236,000					$ 18,050,000			$ 21,199,000			$ 1,078,000
Recorded Investment With No Allowance			14,753,000	1,435,000	1,546,000					507,000	547,000					928,000	999,000					9,365,000	12,646,000					2,052,000	3,866,000					2,130,000	2,877,000					5,183,000			545,000	487,000					458,000			87,000	74,000					11,345,000			5,903,000			561,000
Recorded Investment With Allowance			16,050,000	92,000	131,000											92,000	131,000					5,073,000	15,712,000					1,177,000	1,494,000					1,015,000	1,140,000					2,881,000			149,000	191,000					149,000				16,000					5,314,000			13,078,000			207,000
Total Recorded Investment	16,700,000	16,700,000	30,803,000	1,527,000	1,677,000					507,000	547,000					1,020,000	1,130,000					14,438,000	28,358,000					3,229,000	5,360,000					3,145,000	4,017,000					8,064,000			694,000	678,000					607,000			87,000	90,000					16,659,000			18,981,000			768,000
Related Allowance	1,900,000	1,900,000	2,843,000	272,000	331,000					76,000	82,000					196,000	249,000					1,509,000	2,309,000					419,000	505,000					533,000	494,000					557,000			114,000	179,000					105,000			9,000	24,000					1,895,000			1,310,000			203,000
Average Investment in Impaired Loans	21,200,000	24,400,000				1,527,000	1,685,000	1,577,000	1,768,000			501,000	540,000	516,000	562,000			1,026,000	1,145,000	1,061,000	1,206,000			18,921,000	31,833,000	22,067,000	33,508,000			3,350,000	5,628,000	4,020,000	5,512,000			3,744,000	3,803,000	3,835,000	4,146,000		11,827,000	14,212,000			754,000	751,000	759,000	794,000		664,000	669,000			90,000	247,000	90,000	310,000		21,201,000	24,403,000		22,402,000	23,850,000		998,000	1,104,000	34,516,000	36,380,000
Interest Income Recognized	$ 505,000	$ 210,000				$ 13,000	$ 18,000	$ 30,000	$ 38,000			$ 3,000	$ 4,000	$ 8,000	$ 8,000			$ 10,000	$ 14,000	$ 22,000	$ 30,000			$ 189,000	$ 402,000	$ 459,000	$ 838,000			$ 34,000	$ 71,000	$ 84,000	$ 138,000			$ 37,000	$ 48,000	$ 80,000	$ 104,000		$ 118,000	$ 295,000			$ 8,000	$ 10,000	$ 16,000	$ 20,000		$ 7,000	$ 14,000			$ 1,000	$ 3,000	$ 2,000	$ 8,000		$ 210,000	$ 505,000		$ 283,000	$ 596,000		$ 13,000	$ 28,000	$ 433,000	$ 904,000