Note 5 - Loans (Details) - Delinquencies by Class at December 31, 2012 (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due	$ 3,078	$ 7,580
Greater than 90 days past due on nonaccrual	14,735	15,848
Total past due	19,536	23,428
Current	737,278	715,630
Total loans	756,814	739,058
Total loans, gross		7,580
Total loans, gross		15,072
Total loans, gross		22,652
Total loans, gross		715,630
Total loans, gross	756,814	738,282	733,940
Construction, Land Development and Other Land Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due		175
Greater than 90 days past due on nonaccrual		5,467
Total past due		5,642
Current		61,257
Total loans		66,899
Multi Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due	0	245
Greater than 90 days past due on nonaccrual	181	0
Total past due	181	245
Current	10,514	11,414
Total loans	10,695	11,659
Non Farm Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due	1,342	4,574
Greater than 90 days past due on nonaccrual	4,623	3,732
Total past due	7,688	8,306
Current	361,275	372,348
Total loans	368,963	380,654
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due	1,678	4,994
Greater than 90 days past due on nonaccrual	8,947	9,199
Total past due	12,348	14,193
Current	442,710	445,019
Total loans	455,058	459,212
Total loans, gross	455,058		451,384
Revolving Lines Secured By Single Family Residential Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due	173	245
Greater than 90 days past due on nonaccrual	1,019	816
Total past due	1,192	1,061
Current	64,696	58,690
Total loans	65,888	59,751
Total loans, gross	65,888	59,751
Single Family Residential Closed End First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due	461	1,441
Greater than 90 days past due on nonaccrual	3,585	4,442
Total past due	4,046	5,883
Current	100,709	97,639
Total loans	104,755	103,522
Total loans, gross	104,755	103,522
Single Family Residential Closed End Junior Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due	0	99
Greater than 90 days past due on nonaccrual	232	299
Total past due	232	398
Current	3,818	4,509
Total loans	4,050	4,907
Total loans, gross	4,050	4,907
Single Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due	634	1,785
Greater than 90 days past due on nonaccrual	4,836	5,557
Total past due	5,470	7,342
Current	169,223	160,838
Total loans	174,693	168,180
Total loans, gross	174,693		170,143
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due	373	395
Greater than 90 days past due on nonaccrual	760	826
Total past due	1,133	1,221
Current	65,964	50,440
Total loans	67,097	51,661
Total loans, gross	67,097		51,921
Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due	0	0
Greater than 90 days past due on nonaccrual	3	17
Total past due	3	17
Current	0	0
Total loans	3	17
Total loans, gross	3	17
Consumer Other Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due	393	405
Greater than 90 days past due on nonaccrual	188	247
Total past due	581	652
Current	48,812	49,905
Total loans	49,393	50,557
Total loans, gross	49,393	50,557
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due	393	405
Greater than 90 days past due on nonaccrual	191	264
Total past due	584	669
Current	48,812	49,905
Total loans	49,396	50,574
Total loans, gross	49,396	50,574	51,371
Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due	0	0
Greater than 90 days past due on nonaccrual	0	0
Total past due	0	0
Current	3,195	3,171
Total loans	3,195	3,171
Obligations Of States And Political Subdivisions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due	0	0
Greater than 90 days past due on nonaccrual	0	0
Total past due	0	0
Current	515	739
Total loans	515	739
All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due	0	1
Greater than 90 days past due on nonaccrual	1	2
Total past due	1	3
Current	6,859	5,518
Total loans	6,860	5,521
Total loans, gross	10,570	9,431	9,121
Other Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due	0	1
Greater than 90 days past due on nonaccrual	1	2
Total past due	1	3
Current	10,569	9,428
Total loans	10,570	9,431
Other Loans Held For Sale [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 days past due		0
Greater than 90 days past due on nonaccrual		(776)
Total past due		(776)
Current		0
Total loans		$ (776)