Note 5 - Loans (Details) - Loans Modified Three Months Ended (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Non Farm Nonresidential [Member]
Note 5 - Loans (Details) - Loans Modified Three Months Ended [Line Items]
Number of loans	1	1	3	7
Pre-modification outstanding recorded investment	$ 480	$ 255	$ 3,099	$ 2,066
Post-modification outstanding recorded investment	480	255	3,099	2,066
Commercial Real Estate Loans [Member]
Note 5 - Loans (Details) - Loans Modified Three Months Ended [Line Items]
Number of loans	1	1	4	8
Pre-modification outstanding recorded investment	480	255	3,159	6,155
Post-modification outstanding recorded investment	480	255	3,159	6,155
Single-Family Real Estate [Member]
Note 5 - Loans (Details) - Loans Modified Three Months Ended [Line Items]
Number of loans	0	3	0	4
Pre-modification outstanding recorded investment	0	645	0	715
Post-modification outstanding recorded investment	0	645	0	715
Commercial And Industrial [Member]
Note 5 - Loans (Details) - Loans Modified Three Months Ended [Line Items]
Number of loans	1	0	1	2
Pre-modification outstanding recorded investment	241	0	241	421
Post-modification outstanding recorded investment	241	0	241	416
Loans, Gross [Member]
Note 5 - Loans (Details) - Loans Modified Three Months Ended [Line Items]
Number of loans	2	4	5	14
Pre-modification outstanding recorded investment	721	900	3,400	7,291
Post-modification outstanding recorded investment	721	900	3,400	7,286
Term Concession [Member]
Note 5 - Loans (Details) - Loans Modified Three Months Ended [Line Items]
Number of loans	2	2	4	6
Pre-modification outstanding recorded investment	721	439	3,340	5,047
Post-modification outstanding recorded investment	721	439	3,340	5,047
Rate And Term Concessions [Member]
Note 5 - Loans (Details) - Loans Modified Three Months Ended [Line Items]
Number of loans	0	2	0	8
Pre-modification outstanding recorded investment	0	461	0	2,244
Post-modification outstanding recorded investment	$ 0	$ 461	$ 0	$ 2,239