Note 4 - Loans and Allowance for Loan Losses (Details) - Impaired Loans, Net of Government Guarantees and Excluding Loans Acquired, Segregated by Class of Loans (USD $)	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Consumer:
Unpaid Contractual Principal Balance	$ 15,337,000		$ 15,337,000	$ 15,337,000		$ 20,185,000
Recorded Investment With No Allowance	11,474,000		11,474,000	11,474,000		13,071,000
Recorded Investment With Allowance	5,467,000		5,467,000	5,467,000		5,245,000
Total Recorded Investment	16,941,000		16,941,000	16,941,000		18,316,000
Related Allowance	506,000		506,000	506,000		1,960,000
Average Investment in Impaired Loans	17,749,000	16,520,000		18,186,000	22,396,000
Interest Income Recognized	200,000	161,000	200,000	564,000	665,000
Credit Cards [Member]
Consumer:
Unpaid Contractual Principal Balance	517,000		517,000	517,000		520,000
Recorded Investment With No Allowance	517,000		517,000	517,000		520,000
Total Recorded Investment	517,000		517,000	517,000		520,000
Related Allowance						16,000
Average Investment in Impaired Loans	471,000	514,000		482,000	517,000
Interest Income Recognized		3,000		9,000	11,000
Other Consumer [Member]
Consumer:
Unpaid Contractual Principal Balance	832,000		832,000	832,000		925,000
Recorded Investment With No Allowance	780,000		780,000	780,000		878,000
Recorded Investment With Allowance	35,000		35,000	35,000		32,000
Total Recorded Investment	815,000		815,000	815,000		910,000
Related Allowance	28,000		28,000	28,000		171,000
Average Investment in Impaired Loans	781,000	946,000		821,000	1,014,000
Interest Income Recognized	14,000	9,000		30,000	30,000
Total Consumer Loans [Member]
Consumer:
Unpaid Contractual Principal Balance	1,349,000		1,349,000	1,349,000		1,445,000
Recorded Investment With No Allowance	1,297,000		1,297,000	1,297,000		1,398,000
Recorded Investment With Allowance	35,000		35,000	35,000		32,000
Total Recorded Investment	1,332,000		1,332,000	1,332,000		1,430,000
Related Allowance						187,000
Average Investment in Impaired Loans	1,252,000	1,460,000		1,303,000	1,531,000
Interest Income Recognized	14,000	12,000		39,000	41,000
Construction Loans [Member]
Consumer:
Unpaid Contractual Principal Balance	4,496,000		4,496,000	4,496,000		3,251,000
Recorded Investment With No Allowance	2,028,000		2,028,000	2,028,000		2,036,000
Recorded Investment With Allowance	3,733,000		3,733,000	3,733,000		1,171,000
Total Recorded Investment	5,761,000		5,761,000	5,761,000		3,207,000
Related Allowance						371,000
Average Investment in Impaired Loans	4,323,000	3,212,000		3,662,000	3,814,000
Interest Income Recognized	49,000	32,000		114,000	114,000
Single Family Residential Loans [Member]
Consumer:
Unpaid Contractual Principal Balance	4,953,000		4,953,000	4,953,000		4,497,000
Recorded Investment With No Allowance	4,291,000		4,291,000	4,291,000		2,306,000
Recorded Investment With Allowance	379,000		379,000	379,000		1,645,000
Total Recorded Investment	4,670,000		4,670,000	4,670,000		3,951,000
Related Allowance	180,000		180,000	180,000		745,000
Average Investment in Impaired Loans	4,583,000	3,231,000		4,282,000	3,705,000
Interest Income Recognized	52,000	32,000		133,000	111,000
Other Commercial Real Estate Loans [Member]
Consumer:
Unpaid Contractual Principal Balance	3,288,000		3,288,000	3,288,000		10,328,000
Recorded Investment With No Allowance	2,830,000		2,830,000	2,830,000		6,868,000
Recorded Investment With Allowance	1,320,000		1,320,000	1,320,000		2,319,000
Total Recorded Investment	4,150,000		4,150,000	4,150,000		9,187,000
Related Allowance	298,000		298,000	298,000		564,000
Average Investment in Impaired Loans	6,663,000	7,932,000		8,115,000	12,609,000
Interest Income Recognized	75,000	78,000		252,000	377,000
Total Real Estate Loans [Member]
Consumer:
Unpaid Contractual Principal Balance	12,737,000		12,737,000	12,737,000		18,076,000
Recorded Investment With No Allowance	9,149,000		9,149,000	9,149,000		11,210,000
Recorded Investment With Allowance	5,432,000		5,432,000	5,432,000		5,135,000
Total Recorded Investment	14,581,000		14,581,000	14,581,000		16,345,000
Related Allowance	478,000		478,000	478,000		1,680,000
Average Investment in Impaired Loans	15,569,000	14,375,000		16,059,000	20,128,000
Interest Income Recognized	176,000	142,000		499,000	602,000
Commercial [Member]
Consumer:
Unpaid Contractual Principal Balance	791,000		791,000	791,000		547,000
Recorded Investment With No Allowance	592,000		592,000	592,000		383,000
Recorded Investment With Allowance						78,000
Total Recorded Investment	592,000		592,000	592,000		461,000
Related Allowance						80,000
Average Investment in Impaired Loans	654,000	603,000		646,000	651,000
Interest Income Recognized	7,000	6,000		20,000	19,000
Agricultural Loans [Member]
Consumer:
Unpaid Contractual Principal Balance	460,000		460,000	460,000		117,000
Recorded Investment With No Allowance	436,000		436,000	436,000		80,000
Total Recorded Investment	436,000		436,000	436,000		80,000
Related Allowance						13,000
Average Investment in Impaired Loans	274,000	82,000		178,000	86,000
Interest Income Recognized	3,000	1,000		6,000	3,000
Total Commercial Loans [Member]
Consumer:
Unpaid Contractual Principal Balance	1,251,000		1,251,000	1,251,000		664,000
Recorded Investment With No Allowance	1,028,000		1,028,000	1,028,000		463,000
Recorded Investment With Allowance						78,000
Total Recorded Investment	1,028,000		1,028,000	1,028,000		541,000
Related Allowance						93,000
Average Investment in Impaired Loans	928,000	685,000		824,000	737,000
Interest Income Recognized	$ 10,000	$ 7,000		$ 26,000	$ 22,000