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	3 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	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
	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013 Accruing TDR Loans [Member] Construction Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Accruing TDR Loans [Member] Single Family Residential Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Accruing TDR Loans [Member] Single Family Residential Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Accruing TDR Loans [Member] Other Commercial Real Estate Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Accruing TDR Loans [Member] Other Commercial Real Estate Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Accruing TDR Loans [Member] Real Estate Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Accruing TDR Loans [Member] Real Estate Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Accruing TDR Loans [Member] Other Commercial Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Accruing TDR Loans [Member] Other Commercial Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Accruing TDR Loans [Member] Commercial Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Accruing TDR Loans [Member] Commercial Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Accruing TDR Loans [Member] Agricultural Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Accruing TDR Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Accruing TDR Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Nonaccrual TDR Loans [Member] Construction Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Nonaccrual TDR Loans [Member] Single Family Residential Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Nonaccrual TDR Loans [Member] Other Commercial Real Estate Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Nonaccrual TDR Loans [Member] Other Commercial Real Estate Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Nonaccrual TDR Loans [Member] Real Estate Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Nonaccrual TDR Loans [Member] Real Estate Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Nonaccrual TDR Loans [Member] Other Commercial Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Nonaccrual TDR Loans [Member] Commercial Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Nonaccrual TDR Loans [Member] Agricultural Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Nonaccrual TDR Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Nonaccrual TDR Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Construction Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Construction Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Single Family Residential Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Single Family Residential Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Other Commercial Real Estate Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Other Commercial Real Estate Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Real Estate Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Real Estate Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Other Commercial Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Other Commercial Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Commercial Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Commercial Loans [Member] Loans, excluding acquired loans [Member]	Dec. 31, 2013 Agricultural Loans [Member] Loans, excluding acquired loans [Member]	Jun. 30, 2014 Loans, excluding acquired loans [Member]	Dec. 31, 2013 Loans, excluding acquired loans [Member]
Real estate:
Number	1	2	1	1,000	2,000	4,000	3,000	9,000	5,000	14,000	1,000	1,000	1,000	2,000	1,000	6,000	16,000	1,000	1,000	1,000	1,000	3,000	1,000	1,000	1,000	0	3,000	2,000	1,000	1,000	3,000	4,000	4,000	10,000	8,000	15,000	1,000	2,000	1,000	3,000	1,000	9,000	18,000
Balance				$ 988	$ 395	$ 862	$ 1,782	$ 6,974	$ 2,177	$ 8,824	$ 599	$ 39	$ 599	$ 674	$ 635	$ 2,776	$ 9,498	$ 499	$ 2	$ 630	$ 608	$ 1,131	$ 608	$ 60	$ 60	$ 0	$ 1,131	$ 668	$ 499	$ 988	$ 397	$ 862	$ 2,412	$ 7,582	$ 3,308	$ 9,432	$ 599	$ 99	$ 599	$ 734	$ 635	$ 3,907	$ 10,166