Note 13 - Regulatory Matters (Details) - Actual Capital Levels and Minimum Levels - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Consolidated Entities [Member]
Total capital (to risk weighted assets)
Total capital (to risk weighted assets), actual amount	$ 341,865,000	$ 334,793,000
Total capital (to risk weighted assets), actual ratio	13.60%	14.40%
Total capital (to risk weighted assets), minimum required for capital adequacy purposes amount	$ 200,721,000	$ 185,553,000
Total capital (to risk weighted assets), minimum required for capital adequacy purposes ratio	8.00%	8.00%
Total capital (to risk weighted assets), minimum required to be well capitalized under prompt corrective action regulations amount
Tier 1 capital (to risk weighted assets)
Tier 1 capital (to risk weighted assets), actual amount	$ 325,304,000	$ 314,752,000
Tier 1 capital (to risk weighted assets), actual ratio	13.00%	13.60%
Tier 1 capital (to risk weighted assets), minimum required for capital adequacy purposes amount	$ 150,541,000	$ 92,777,000
Tier 1 capital (to risk weighted assets), minimum required for capital adequacy purposes ratio	6.00%	4.00%
Tier 1 capital (to risk weighted assets), minimum required to be well capitalized under prompt corrective action regulations amount
Common equity tier 1 (to risk weighted assets)
Common equity tier 1 (to risk weighted assets), actual amount	$ 274,601,000
Common equity tier 1 (to risk weighted assets), actual ratio	10.90%
Common equity tier 1 (to risk weighted assets), minimum required for capital adequacy purposes amount	$ 112,997,000
Common equity tier 1 (to risk weighted assets), minimum required for capital adequacy purposes ratio	4.50%
Common equity tier 1 (to risk weighted assets), minimum required to be well capitalized under prompt corrective action regulations amount
Tier 1 capital (to average assets)
Tier 1 capital (to average assets), actual amount	$ 325,304,000	$ 314,752,000
Tier 1 capital (to average assets), actual ratio	11.60%	11.20%
Tier 1 capital (to average assets), minimum required for capital adequacy purposes amount	$ 112,364,000	$ 112,949,000
Tier 1 capital (to risk average assets), minimum required for capital adequacy purposes ratio	4.00%	4.00%
Tier 1 capital (to risk average assets), minimum required to be well capitalized under prompt corrective action regulations amount
Bank [Member]
Total capital (to risk weighted assets)
Total capital (to risk weighted assets), actual amount	$ 345,719,000	$ 332,749,000
Total capital (to risk weighted assets), actual ratio	13.80%	14.40%
Total capital (to risk weighted assets), minimum required for capital adequacy purposes amount	$ 200,822,000	$ 185,309,000
Total capital (to risk weighted assets), minimum required for capital adequacy purposes ratio	8.00%	8.00%
Total capital (to risk weighted assets), minimum required to be well capitalized under prompt corrective action regulations amount	$ 0.100	$ 0.100
Tier 1 capital (to risk weighted assets)
Tier 1 capital (to risk weighted assets), actual amount	$ 329,158,000	$ 312,708,000
Tier 1 capital (to risk weighted assets), actual ratio	13.10%	13.50%
Tier 1 capital (to risk weighted assets), minimum required for capital adequacy purposes amount	$ 150,617,000	$ 92,655,000
Tier 1 capital (to risk weighted assets), minimum required for capital adequacy purposes ratio	6.00%	4.00%
Tier 1 capital (to risk weighted assets), minimum required to be well capitalized under prompt corrective action regulations amount	$ 8,000	$ 6,000
Common equity tier 1 (to risk weighted assets)
Common equity tier 1 (to risk weighted assets), actual amount	$ 329,158,000
Common equity tier 1 (to risk weighted assets), actual ratio	13.10%
Common equity tier 1 (to risk weighted assets), minimum required for capital adequacy purposes amount	$ 112,963,000
Common equity tier 1 (to risk weighted assets), minimum required for capital adequacy purposes ratio	4.50%
Common equity tier 1 (to risk weighted assets), minimum required to be well capitalized under prompt corrective action regulations amount	$ 6,500
Tier 1 capital (to average assets)
Tier 1 capital (to average assets), actual amount	$ 329,158,000	$ 312,708,000
Tier 1 capital (to average assets), actual ratio	11.70%	11.10%
Tier 1 capital (to average assets), minimum required for capital adequacy purposes amount	$ 112,487,000	$ 112,856,000
Tier 1 capital (to risk average assets), minimum required for capital adequacy purposes ratio	4.00%	4.00%
Tier 1 capital (to risk average assets), minimum required to be well capitalized under prompt corrective action regulations amount	$ 5,000	$ 5,000