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Note 3 - Loans and Allowance for Loan Losses (Details) - Impaired Loans (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
With no related allowance recorded:
Loans with no related allowance recorded - unpaid contractual principal balance	$ 7,086,000	$ 6,689,000
Loans with no related allowance recorded - recorded principal balance	4,254,000	3,500,000
Loans with no related allowance recorded - year-to-date average recorded principal balance	3,878,000	8,917,000
With an allowance recorded:
Loans with a related allowance recorded - unpaid contractual principal balance	29,739,000	34,367,000
Loans with a related allowance recorded - recorded principal balance	29,141,000	33,368,000
Loans with a related allowance recorded - related allowance	10,479,000	12,386,000
Loans with a related allowance recorded - year-to-date average recorded principal balance	31,254,000	41,044,000
Total impaired loans:
Impaired loans - unpaid contractual principal balance	36,825,000	41,056,000
Impaired loans - recorded principal balance	33,395,000	36,868,000
Impaired loans - related allowance	10,479,000	12,386,000
Impaired loans - year-to-date average recorded principal balance	35,132,000	49,961,000
Commercial and Industrial [Member]
With no related allowance recorded:
Loans with no related allowance recorded - unpaid contractual principal balance	1,693,000	2,229,000
Loans with no related allowance recorded - recorded principal balance	205,000	511,000
Loans with no related allowance recorded - year-to-date average recorded principal balance	358,000	1,205,000
With an allowance recorded:
Loans with a related allowance recorded - unpaid contractual principal balance	1,006,000	1,517,000
Loans with a related allowance recorded - recorded principal balance	953,000	1,440,000
Loans with a related allowance recorded - related allowance	451,000	792,000
Loans with a related allowance recorded - year-to-date average recorded principal balance	1,197,000	1,880,000
Total impaired loans:
Impaired loans - related allowance	451,000	792,000
Vacant Land,Land Developement and Residential Construction [Member]
With no related allowance recorded:
Loans with no related allowance recorded - unpaid contractual principal balance	459,000	475,000
Loans with no related allowance recorded - recorded principal balance	343,000	362,000
Loans with no related allowance recorded - year-to-date average recorded principal balance	353,000	991,000
With an allowance recorded:
Loans with a related allowance recorded - unpaid contractual principal balance	4,213,000	4,436,000
Loans with a related allowance recorded - recorded principal balance	3,908,000	4,139,000
Loans with a related allowance recorded - related allowance	728,000	844,000
Loans with a related allowance recorded - year-to-date average recorded principal balance	4,023,000	3,354,000
Total impaired loans:
Impaired loans - related allowance	728,000	844,000
Real Estate-Owner Occupied [Member]
With no related allowance recorded:
Loans with no related allowance recorded - unpaid contractual principal balance	1,165,000	1,270,000
Loans with no related allowance recorded - recorded principal balance	684,000	785,000
Loans with no related allowance recorded - year-to-date average recorded principal balance	735,000	1,084,000
With an allowance recorded:
Loans with a related allowance recorded - unpaid contractual principal balance	1,488,000	1,513,000
Loans with a related allowance recorded - recorded principal balance	1,488,000	1,513,000
Loans with a related allowance recorded - related allowance	455,000	528,000
Loans with a related allowance recorded - year-to-date average recorded principal balance	1,500,000	2,550,000
Total impaired loans:
Impaired loans - related allowance	455,000	528,000
Real Estate-Non-Owner Occupied [Member]
With no related allowance recorded:
Loans with no related allowance recorded - unpaid contractual principal balance	1,831,000	895,000
Loans with no related allowance recorded - recorded principal balance	1,761,000	733,000
Loans with no related allowance recorded - year-to-date average recorded principal balance	1,247,000	4,049,000
With an allowance recorded:
Loans with a related allowance recorded - unpaid contractual principal balance	19,470,000	21,088,000
Loans with a related allowance recorded - recorded principal balance	19,451,000	21,072,000
Loans with a related allowance recorded - related allowance	7,370,000	7,969,000
Loans with a related allowance recorded - year-to-date average recorded principal balance	20,262,000	28,388,000
Total impaired loans:
Impaired loans - related allowance	7,370,000	7,969,000
Real Estate-Multi Family And Residential Rental [Member]
With no related allowance recorded:
Loans with no related allowance recorded - unpaid contractual principal balance	41,000	41,000
Loans with no related allowance recorded - recorded principal balance	1,000	1,000
Loans with no related allowance recorded - year-to-date average recorded principal balance	1,000	390,000
With an allowance recorded:
Loans with a related allowance recorded - unpaid contractual principal balance	1,207,000	3,219,000
Loans with a related allowance recorded - recorded principal balance	1,089,000	2,684,000
Loans with a related allowance recorded - related allowance	504,000	1,127,000
Loans with a related allowance recorded - year-to-date average recorded principal balance	1,886,000	2,915,000
Total impaired loans:
Impaired loans - related allowance	504,000	1,127,000
Commercial [Member]
With no related allowance recorded:
Loans with no related allowance recorded - unpaid contractual principal balance	5,189,000	4,910,000
Loans with no related allowance recorded - recorded principal balance	2,994,000	2,392,000
Loans with no related allowance recorded - year-to-date average recorded principal balance	2,694,000	7,719,000
With an allowance recorded:
Loans with a related allowance recorded - unpaid contractual principal balance	27,384,000	31,773,000
Loans with a related allowance recorded - recorded principal balance	26,889,000	30,848,000
Loans with a related allowance recorded - related allowance	9,508,000	11,260,000
Loans with a related allowance recorded - year-to-date average recorded principal balance	28,868,000	39,087,000
Total impaired loans:
Impaired loans - unpaid contractual principal balance	32,573,000	36,683,000
Impaired loans - recorded principal balance	29,883,000	33,240,000
Impaired loans - related allowance	9,508,000	11,260,000
Impaired loans - year-to-date average recorded principal balance	31,562,000	46,806,000
Retail Home Equity and Other [Member]
With no related allowance recorded:
Loans with no related allowance recorded - unpaid contractual principal balance	707,000	507,000
Loans with no related allowance recorded - recorded principal balance	649,000	461,000
Loans with no related allowance recorded - year-to-date average recorded principal balance	555,000	471,000
With an allowance recorded:
Loans with a related allowance recorded - unpaid contractual principal balance	118,000	320,000
Loans with a related allowance recorded - recorded principal balance	92,000	289,000
Loans with a related allowance recorded - related allowance	92,000	96,000
Loans with a related allowance recorded - year-to-date average recorded principal balance	190,000	329,000
Total impaired loans:
Impaired loans - related allowance	92,000	96,000
Retail 1-4 Family Mortgages [Member]
With no related allowance recorded:
Loans with no related allowance recorded - unpaid contractual principal balance	1,190,000	1,272,000
Loans with no related allowance recorded - recorded principal balance	611,000	647,000
Loans with no related allowance recorded - year-to-date average recorded principal balance	629,000	727,000
With an allowance recorded:
Loans with a related allowance recorded - unpaid contractual principal balance	2,237,000	2,274,000
Loans with a related allowance recorded - recorded principal balance	2,160,000	2,231,000
Loans with a related allowance recorded - related allowance	879,000	1,030,000
Loans with a related allowance recorded - year-to-date average recorded principal balance	2,196,000	1,628,000
Total impaired loans:
Impaired loans - related allowance	879,000	1,030,000
Retail [Member]
With no related allowance recorded:
Loans with no related allowance recorded - unpaid contractual principal balance	1,897,000	1,779,000
Loans with no related allowance recorded - recorded principal balance	1,260,000	1,108,000
Loans with no related allowance recorded - year-to-date average recorded principal balance	1,184,000	1,198,000
With an allowance recorded:
Loans with a related allowance recorded - unpaid contractual principal balance	2,355,000	2,594,000
Loans with a related allowance recorded - recorded principal balance	2,252,000	2,520,000
Loans with a related allowance recorded - related allowance	971,000	1,126,000
Loans with a related allowance recorded - year-to-date average recorded principal balance	2,386,000	1,957,000
Total impaired loans:
Impaired loans - unpaid contractual principal balance	4,252,000	4,373,000
Impaired loans - recorded principal balance	3,512,000	3,628,000
Impaired loans - related allowance	971,000	1,126,000
Impaired loans - year-to-date average recorded principal balance	$ 3,570,000	$ 3,155,000

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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