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
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Consumer:
Unpaid Contractual Principal Balance	$ 19,396,000		$ 19,396,000		$ 20,185,000
Recorded Investment With No Allowance	16,043,000		16,043,000		13,071,000
Recorded Investment With Allowance	2,513,000		2,513,000		5,245,000
Total Recorded Investment	18,556,000		18,556,000		18,316,000
Related Allowance	2,012,000		2,012,000		1,960,000
Average Investment in Impaired Loans	18,743,000	21,201,000	18,601,000	24,403,000
Interest Income Recognized	158,000	210,000	364,000	505,000
Credit Cards [Member]
Consumer:
Unpaid Contractual Principal Balance	423,000		423,000		520,000
Recorded Investment With No Allowance	424,000		424,000		520,000
Total Recorded Investment	424,000		424,000		520,000
Related Allowance	13,000		13,000		16,000
Average Investment in Impaired Loans	446,000	501,000	470,000	516,000
Interest Income Recognized	4,000	3,000	9,000	8,000
Other Consumer [Member]
Consumer:
Unpaid Contractual Principal Balance	771,000		771,000		925,000
Recorded Investment With No Allowance	706,000		706,000		878,000
Recorded Investment With Allowance	41,000		41,000		32,000
Total Recorded Investment	747,000		747,000		910,000
Related Allowance	166,000		166,000		171,000
Average Investment in Impaired Loans	778,000	1,026,000	823,000	1,061,000
Interest Income Recognized	7,000	10,000	16,000	22,000
Total Consumer Loans [Member]
Consumer:
Unpaid Contractual Principal Balance	1,194,000		1,194,000		1,445,000
Recorded Investment With No Allowance	1,130,000		1,130,000		1,398,000
Recorded Investment With Allowance	41,000		41,000		32,000
Total Recorded Investment	1,171,000		1,171,000		1,430,000
Related Allowance	179,000		179,000		187,000
Average Investment in Impaired Loans	1,224,000	1,527,000	1,293,000	1,577,000
Interest Income Recognized	11,000	13,000	25,000	30,000
Construction Loans [Member]
Consumer:
Unpaid Contractual Principal Balance	2,929,000		2,929,000		3,251,000
Recorded Investment With No Allowance	2,825,000		2,825,000		2,036,000
Recorded Investment With Allowance	60,000		60,000		1,171,000
Total Recorded Investment	2,885,000		2,885,000		3,207,000
Related Allowance	76,000		76,000		371,000
Average Investment in Impaired Loans	2,840,000	3,350,000	2,962,000	4,020,000
Interest Income Recognized	24,000	34,000	58,000	84,000
Single Family Residential Loans [Member]
Consumer:
Unpaid Contractual Principal Balance	4,683,000		4,683,000		4,497,000
Recorded Investment With No Allowance	3,387,000		3,387,000		2,306,000
Recorded Investment With Allowance	1,108,000		1,108,000		1,645,000
Total Recorded Investment	4,495,000		4,495,000		3,951,000
Related Allowance	973,000		973,000		745,000
Average Investment in Impaired Loans	4,254,000	3,744,000	4,153,000	3,835,000
Interest Income Recognized	36,000	37,000	81,000	80,000
Other Commercial Real Estate Loans [Member]
Consumer:
Unpaid Contractual Principal Balance	9,392,000		9,392,000		10,328,000
Recorded Investment With No Allowance	7,875,000		7,875,000		6,868,000
Recorded Investment With Allowance	1,303,000		1,303,000		2,319,000
Total Recorded Investment	9,178,000		9,178,000		9,187,000
Related Allowance	648,000		648,000		564,000
Average Investment in Impaired Loans	9,562,000	11,826,000	9,437,000	14,212,000
Interest Income Recognized	80,000	118,000	185,000	295,000
Total Real Estate Loans [Member]
Consumer:
Unpaid Contractual Principal Balance	17,004,000		17,004,000		18,076,000
Recorded Investment With No Allowance	14,087,000		14,087,000		11,210,000
Recorded Investment With Allowance	2,471,000		2,471,000		5,135,000
Total Recorded Investment	16,558,000		16,558,000		16,345,000
Related Allowance	1,697,000		1,697,000		1,680,000
Average Investment in Impaired Loans	16,656,000	18,920,000	16,552,000	22,067,000
Interest Income Recognized	140,000	189,000	324,000	459,000
Commercial [Member]
Consumer:
Unpaid Contractual Principal Balance	869,000		869,000		547,000
Recorded Investment With No Allowance	714,000		714,000		383,000
Recorded Investment With Allowance	1,000		1,000		78,000
Total Recorded Investment	715,000		715,000		461,000
Related Allowance	121,000		121,000		80,000
Average Investment in Impaired Loans	765,000	664,000	664,000	669,000
Interest Income Recognized	6,000	7,000	13,000	14,000
Agricultural Loans [Member]
Consumer:
Unpaid Contractual Principal Balance	329,000		329,000		117,000
Recorded Investment With No Allowance	112,000		112,000		80,000
Total Recorded Investment	112,000		112,000		80,000
Related Allowance	15,000		15,000		13,000
Average Investment in Impaired Loans	98,000	90,000	92,000	90,000
Interest Income Recognized	1,000	1,000	2,000	2,000
Total Commercial Loans [Member]
Consumer:
Unpaid Contractual Principal Balance	1,198,000		1,198,000		664,000
Recorded Investment With No Allowance	826,000		826,000		463,000
Recorded Investment With Allowance	1,000		1,000		78,000
Total Recorded Investment	827,000		827,000		541,000
Related Allowance	136,000		136,000		93,000
Average Investment in Impaired Loans	863,000	754,000	756,000	759,000
Interest Income Recognized	$ 7,000	$ 8,000	$ 15,000	$ 16,000