Note 4 - Loans and Allowance for Loan Losses (Details) - Troubled debt restructurings, excluding loans acquired, segregated by class of loans: (USD $) In Thousands, unless otherwise specified	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended				6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended		6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2012 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Other Consumer [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Other Consumer [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Consumer Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Consumer Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Construction Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Construction Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Single Family Residential Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Single Family Residential Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Other Commercial Real Estate Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Other Commercial Real Estate Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Real Estate Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Real Estate Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Other Commercial Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Other Commercial Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Agricultural Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Agricultural Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Commercial Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member] Commercial Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Accruing TDR Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Nonaccrual TDR Loans [Member] Other Consumer [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Nonaccrual TDR Loans [Member] Consumer Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Nonaccrual TDR Loans [Member] Construction Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Nonaccrual TDR Loans [Member] Single Family Residential Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Nonaccrual TDR Loans [Member] Single Family Residential Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Nonaccrual TDR Loans [Member] Other Commercial Real Estate Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Nonaccrual TDR Loans [Member] Other Commercial Real Estate Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Nonaccrual TDR Loans [Member] Real Estate Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Nonaccrual TDR Loans [Member] Real Estate Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Nonaccrual TDR Loans [Member] Other Commercial Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Nonaccrual TDR Loans [Member] Other Commercial Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Nonaccrual TDR Loans [Member] Agricultural Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Nonaccrual TDR Loans [Member] Commercial Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Nonaccrual TDR Loans [Member] Commercial Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Nonaccrual TDR Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Nonaccrual TDR Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Other Consumer [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Other Consumer [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Consumer Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Consumer Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Construction Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Construction Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Single Family Residential Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Single Family Residential Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Other Commercial Real Estate Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Other Commercial Real Estate Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Real Estate Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Real Estate Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Other Commercial Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Other Commercial Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Agricultural Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Agricultural Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member] Commercial Loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member] Commercial Loans [Member]	Dec. 31, 2012 Loans, excluding acquired loans [Member]	Jun. 30, 2013 Loans, excluding acquired loans [Member]
Consumer:
Number of TDR loans	6	1	1	1	1	2	1	3	4	14	13	19	18	1	2	1	1	2	3	22	22	1	1	0	1	1	4	1	5	2	1	1	0	1	1	7	3	2	1	2	1	2	1	4	5	18	14	24	20	2	3	1	1	3	4	29	25
Balance on TDR loans (in Dollars)		$ 33	$ 33	$ 33	$ 33	$ 1,212	$ 988	$ 570	$ 885	$ 8,508	$ 7,840	$ 10,290	$ 9,713	$ 39	$ 76	$ 653	$ 652	$ 692	$ 728	$ 11,015	$ 10,474	$ 12	$ 12	$ 0	$ 15	$ 11	$ 2,962	$ 608	$ 2,977	$ 619	$ 85	$ 85	$ 0	$ 85	$ 85	$ 3,074	$ 704	$ 45	$ 33	$ 45	$ 33	$ 1,212	$ 988	$ 585	$ 896	$ 11,470	$ 8,448	$ 13,267	$ 10,332	$ 124	$ 161	$ 653	$ 652	$ 777	$ 813	$ 14,089	$ 11,178