Note 4 - Loans (Details) - Loans Modified Three Months Ended (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Non Farm Nonresidential [Member]
Note 4 - Loans (Details) - Loans Modified Three Months Ended [Line Items]
Number of loans	2	1	2	6
Pre-modification outstanding recorded investment	$ 2,619	$ 243	$ 2,619	$ 1,811
Post-modification outstanding recorded investment	2,619	243	2,619	1,811
Commercial Real Estate Loans [Member]
Note 4 - Loans (Details) - Loans Modified Three Months Ended [Line Items]
Number of loans	2	1	3	7
Pre-modification outstanding recorded investment	2,619	243	2,679	5,900
Post-modification outstanding recorded investment	2,619	243	2,679	5,900
Single-Family Real Estate [Member]
Note 4 - Loans (Details) - Loans Modified Three Months Ended [Line Items]
Number of loans	0	1	0	1
Pre-modification outstanding recorded investment	0	70	0	70
Post-modification outstanding recorded investment	0	70	0	70
Commercial And Industrial [Member]
Note 4 - Loans (Details) - Loans Modified Three Months Ended [Line Items]
Number of loans	0	1	0	2
Pre-modification outstanding recorded investment	0	206	0	421
Post-modification outstanding recorded investment	0	206	0	416
Total Commercial and Industrial [Member]
Note 4 - Loans (Details) - Loans Modified Three Months Ended [Line Items]
Number of loans	2	3
Pre-modification outstanding recorded investment	2,619	519
Post-modification outstanding recorded investment	2,619	519
Other Loans Held For Sale [Member]
Note 4 - Loans (Details) - Loans Modified Three Months Ended [Line Items]
Number of loans	0	0	0	0
Pre-modification outstanding recorded investment	0	0	0	0
Post-modification outstanding recorded investment	0	0	0	0
Loans, Gross [Member]
Note 4 - Loans (Details) - Loans Modified Three Months Ended [Line Items]
Number of loans	2	3	3	10
Pre-modification outstanding recorded investment	2,619	519	2,679	6,391
Post-modification outstanding recorded investment	2,619	519	2,679	6,386
Term Concession [Member]
Note 4 - Loans (Details) - Loans Modified Three Months Ended [Line Items]
Number of loans	2	3	2	4
Pre-modification outstanding recorded investment	2,619	519	2,619	4,608
Post-modification outstanding recorded investment	2,619	519	2,619	4,608
Total Team Concession [Member]
Note 4 - Loans (Details) - Loans Modified Three Months Ended [Line Items]
Number of loans	2	3
Pre-modification outstanding recorded investment	2,619	519
Post-modification outstanding recorded investment	$ 2,619	$ 519