Note 5 - Loans (Details) - Delinquencies by Class (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	$ 3,442	$ 3,202
Loans, greater than 90 days past due and still accruing	243
Loans, greater than 90 days past due and not accruing (nonaccrual)	14,611	15,108
Loans, past due	18,296	18,310
Loans, current	758,651	749,203
Loans, gross	776,947	767,513	756,814
Construction, Land Development and Other Land Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	89	82
Loans, greater than 90 days past due and not accruing (nonaccrual)	1,205	3,872
Loans, past due	1,294	3,954
Loans, current	47,451	72,604
Loans, gross	48,745	76,558
Multi Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, greater than 90 days past due and not accruing (nonaccrual)		181
Loans, past due		181
Loans, current	17,970	10,236
Loans, gross	17,970	10,417
Non Farm Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	1,421	1,199
Loans, greater than 90 days past due and not accruing (nonaccrual)	9,194	4,832
Loans, past due	10,615	6,031
Loans, current	368,918	362,446
Loans, gross	379,533	368,477
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	1,510	1,281
Loans, greater than 90 days past due and not accruing (nonaccrual)	10,399	8,885
Loans, past due	11,909	10,166
Loans, current	434,339	445,286
Loans, gross	446,248	455,452	455,058
Single-family Real Estate, Revolving, Open-end Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	454	148
Loans, greater than 90 days past due and not accruing (nonaccrual)	790	797
Loans, past due	1,244	945
Loans, current	75,127	68,973
Loans, gross	76,371	69,918
Single Family Residential Closed End First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	261	1,091
Loans, greater than 90 days past due and still accruing	243
Loans, greater than 90 days past due and not accruing (nonaccrual)	2,092	3,176
Loans, past due	2,596	4,267
Loans, current	111,988	100,009
Loans, gross	114,584	104,276
Single Family Residential Closed End Junior Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	21	41
Loans, greater than 90 days past due and not accruing (nonaccrual)	85	129
Loans, past due	106	170
Loans, current	2,813	3,761
Loans, gross	2,919	3,931
Single Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	736	1,280
Loans, greater than 90 days past due and still accruing	243
Loans, greater than 90 days past due and not accruing (nonaccrual)	2,967	4,102
Loans, past due	3,946	5,382
Loans, current	189,928	172,743
Loans, gross	193,874	178,125	174,693
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	994	306
Loans, greater than 90 days past due and not accruing (nonaccrual)	1,122	1,885
Loans, past due	2,116	2,191
Loans, current	71,447	70,887
Loans, gross	73,563	73,078	67,097
Indirect Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	176	294
Loans, greater than 90 days past due and not accruing (nonaccrual)	104	210
Loans, past due	280	504
Loans, current	41,971	38,220
Loans, gross	42,251	38,724
Consumer Other Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	26	41
Loans, greater than 90 days past due and not accruing (nonaccrual)	19	26
Loans, past due	45	67
Loans, current	10,775	11,308
Loans, gross	10,820	11,375
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	202	335
Loans, greater than 90 days past due and not accruing (nonaccrual)	123	236
Loans, past due	325	571
Loans, current	52,746	49,528
Loans, gross	53,071	50,099	49,396
Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, current	3,689	3,394
Loans, gross	3,689	3,394
Obligations Of States And Political Subdivisions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, current	435	497
Loans, gross	435	497
Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, current	6,067	6,868
Loans, gross	6,067	6,868
All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, current	10,191	10,759
Loans, gross	$ 10,191	$ 10,759	$ 10,570