Note 5 - Loans (Details) - Delinquencies by Class (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	$ 3,885	$ 3,202
Loans, greater than 90 days past due and still accruing	238
Loans, greater than 90 days past due and not accruing (nonaccrual)	12,463	15,108
Loans, past due	16,586	18,310
Loans, current	788,473	749,203
Loans, gross	805,059	767,513
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	112	82
Loans, greater than 90 days past due and not accruing (nonaccrual)	441	3,872
Loans, past due	553	3,954
Loans, current	47,510	72,604
Loans, gross	48,063	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	9,025	10,236
Loans, gross	9,025	10,417
Non Farm Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	2,102	1,199
Loans, greater than 90 days past due and not accruing (nonaccrual)	8,174	4,832
Loans, past due	10,276	6,031
Loans, current	362,661	362,446
Loans, gross	372,937	368,477
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	2,214	1,281
Loans, greater than 90 days past due and not accruing (nonaccrual)	8,615	8,885
Loans, past due	10,829	10,166
Loans, current	419,196	445,286
Loans, gross	430,025	455,452
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	151	148
Loans, greater than 90 days past due and not accruing (nonaccrual)	977	797
Loans, past due	1,128	945
Loans, current	79,516	68,973
Loans, gross	80,644	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	827	1,091
Loans, greater than 90 days past due and still accruing	238
Loans, greater than 90 days past due and not accruing (nonaccrual)	1,928	3,176
Loans, past due	2,993	4,267
Loans, current	118,014	100,009
Loans, gross	121,007	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	16	41
Loans, greater than 90 days past due and not accruing (nonaccrual)	78	129
Loans, past due	94	170
Loans, current	2,694	3,761
Loans, gross	2,788	3,931
Single Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	994	1,280
Loans, greater than 90 days past due and still accruing	238
Loans, greater than 90 days past due and not accruing (nonaccrual)	2,983	4,102
Loans, past due	4,215	5,382
Loans, current	200,224	172,743
Loans, gross	204,439	178,125
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	361	306
Loans, greater than 90 days past due and not accruing (nonaccrual)	715	1,885
Loans, past due	1,076	2,191
Loans, current	79,851	70,887
Loans, gross	80,927	73,078
Indirect Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	283	294
Loans, greater than 90 days past due and not accruing (nonaccrual)	116	210
Loans, past due	399	504
Loans, current	65,878	38,220
Loans, gross	66,277	38,724
Consumer Other Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	33	41
Loans, greater than 90 days past due and not accruing (nonaccrual)	34	26
Loans, past due	67	67
Loans, current	10,640	11,308
Loans, gross	10,707	11,375
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	316	335
Loans, greater than 90 days past due and not accruing (nonaccrual)	150	236
Loans, past due	466	571
Loans, current	76,518	49,528
Loans, gross	76,984	50,099
Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, current	6,032	3,394
Loans, gross	6,032	3,394
Obligations Of States And Political Subdivisions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, current	416	497
Loans, gross	416	497
Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, current	6,236	6,868
Loans, gross	6,236	6,868
All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, current	12,684	10,759
Loans, gross	$ 12,684	$ 10,759