Note 5 - Loans (Details) - Delinquencies by Class (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	$ 2,787	$ 3,885
Loans, greater than 90 days past due and still accruing	233	238
Loans, greater than 90 days past due and not accruing (nonaccrual)	10,362	12,463
Loans, past due	13,382	16,586
Loans, current	818,647	788,473
Loans, gross	832,029	805,059	755,878
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
Loans, greater than 90 days past due and not accruing (nonaccrual)	345	441
Loans, past due	345	553
Loans, current	47,657	47,510
Loans, gross	48,002	48,063
Multi Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, current	8,868	9,025
Loans, gross	8,868	9,025
Non Farm Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	1,064	2,102
Loans, greater than 90 days past due and not accruing (nonaccrual)	6,842	8,174
Loans, past due	7,906	10,276
Loans, current	365,322	362,661
Loans, gross	373,228	372,937
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	1,064	2,214
Loans, greater than 90 days past due and not accruing (nonaccrual)	7,187	8,615
Loans, past due	8,251	10,829
Loans, current	421,847	419,196
Loans, gross	430,098	430,025	445,153
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	229	151
Loans, greater than 90 days past due and not accruing (nonaccrual)	702	977
Loans, past due	931	1,128
Loans, current	82,175	79,516
Loans, gross	83,106	80,644
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	754	827
Loans, greater than 90 days past due and still accruing	233	238
Loans, greater than 90 days past due and not accruing (nonaccrual)	1,821	1,928
Loans, past due	2,808	2,993
Loans, current	128,468	118,014
Loans, gross	131,276	121,007
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	100	16
Loans, greater than 90 days past due and not accruing (nonaccrual)	47	78
Loans, past due	147	94
Loans, current	2,645	2,694
Loans, gross	2,792	2,788
Single Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	1,083	994
Loans, greater than 90 days past due and still accruing	233	238
Loans, greater than 90 days past due and not accruing (nonaccrual)	2,570	2,983
Loans, past due	3,886	4,215
Loans, current	213,288	200,224
Loans, gross	217,174	204,439	176,454
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	339	361
Loans, greater than 90 days past due and not accruing (nonaccrual)	469	715
Loans, past due	808	1,076
Loans, current	95,429	79,851
Loans, gross	96,237	80,927	72,477
Indirect Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	272	283
Loans, greater than 90 days past due and not accruing (nonaccrual)	113	116
Loans, past due	385	399
Loans, current	65,270	65,878
Loans, gross	65,655	66,277
Consumer Other Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	29	33
Loans, greater than 90 days past due and not accruing (nonaccrual)	23	34
Loans, past due	52	67
Loans, current	10,214	10,640
Loans, gross	10,266	10,707
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 days past due and still accruing	301	316
Loans, greater than 90 days past due and not accruing (nonaccrual)	136	150
Loans, past due	437	466
Loans, current	75,484	76,518
Loans, gross	75,921	76,984	51,319
Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, current	5,897	6,032
Loans, gross	5,897	6,032
Obligations Of States And Political Subdivisions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, current	396	416
Loans, gross	396	416
Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, current	6,306	6,236
Loans, gross	6,306	6,236
All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, current	12,599	12,684
Loans, gross	$ 12,599	$ 12,684	$ 10,475