Note 17 - Branch Acquisition - Assessment of Consideration Transferred, Assets Purchased, and Liabilities Assumed (Details) - Bank of America Branches [Member] - USD ($)	Mar. 11, 2016	Mar. 31, 2016
Portion at Other than Fair Value Measurement [Member]
Payments to Acquire Businesses, Gross
Total consideration
Cash and cash equivalents	149,067,000
Premises and equipment, net	1,835,000
Other assets	201,000
Core deposit intangibles
Total assets acquired	151,103,000
Deposits	149,047,000
Other liabilities	20,000
Total liabilities assumed	149,067,000
Net identifiable assets acquired over liabilities assumed	2,036,000
Goodwill
Changes Measurement [Member]
Payments to Acquire Businesses, Gross
Total consideration
Cash and cash equivalents
Premises and equipment, net	2,355,000
Other assets
Core deposit intangibles	1,772,000
Total assets acquired	4,127,000
Deposits
Other liabilities	172,000
Total liabilities assumed	172,000
Net identifiable assets acquired over liabilities assumed	3,955,000
Goodwill
Payments to Acquire Businesses, Gross	6,656,000
Total consideration	6,656,000
Cash and cash equivalents	149,067,000
Premises and equipment, net	4,190,000
Other assets	201,000
Core deposit intangibles	1,772,000
Total assets acquired	155,230,000
Deposits	149,047,000
Other liabilities	192,000
Total liabilities assumed	149,239,000
Net identifiable assets acquired over liabilities assumed	5,991,000
Goodwill	$ 665,000	$ 665,000