Note 22 - Fair Value Measurements - Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Securities available for sale, at fair value	$ 255,844	$ 186,751
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities available for sale, at fair value	108,237	42,010
Agency Collateralized Mortgage Obligations [Member]
Securities available for sale, at fair value	16,028	9,331
US Government Agencies Debt Securities [Member]
Securities available for sale, at fair value	68,662	84,453
Municipal Notes [Member]
Securities available for sale, at fair value	62,843	50,839
Mutual Funds [Member]
Securities available for sale, at fair value	74	118
Fair Value, Measurements, Recurring [Member]
Securities available for sale, at fair value	255,844	186,751
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale, at fair value	74	118
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale, at fair value	255,770	186,633
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities available for sale, at fair value	108,237	42,010
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale, at fair value	108,237	42,010
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]
Securities available for sale, at fair value	16,028	9,331
Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale, at fair value	16,028	9,331
Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]
Securities available for sale, at fair value	68,662	84,453
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale, at fair value	68,662	84,453
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]
Securities available for sale, at fair value	62,843	50,839
Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale, at fair value	62,843	50,839
Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Mutual Funds [Member]
Securities available for sale, at fair value	74	118
Fair Value, Measurements, Recurring [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale, at fair value	74	118
Fair Value, Measurements, Recurring [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale, at fair value	0	0
Fair Value, Measurements, Nonrecurring [Member]
Impaired loans	3,622	5,780
Loans held for sale	4,507	3,081
Foreclosed real estate	4,674	4,890
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans	0	0
Loans held for sale	0	0
Foreclosed real estate	0	0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans	0	0
Loans held for sale	4,507	3,081
Foreclosed real estate	0	0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans	3,622	5,780
Loans held for sale	0	0
Foreclosed real estate	4,674	4,890
Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member]
Impaired loans	2,060	1,990
Foreclosed real estate	226	557
Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans	0	0
Foreclosed real estate	0	0
Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans	0	0
Foreclosed real estate	0	0
Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans	2,060	1,990
Foreclosed real estate	226	557
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member]
Impaired loans	1,217	3,574
Foreclosed real estate	4,448	4,130
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans	0	0
Foreclosed real estate	0	0
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans	0	0
Foreclosed real estate	0	0
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans	1,217	3,574
Foreclosed real estate	4,448	4,130
Fair Value, Measurements, Nonrecurring [Member] | Land Segment [Member]
Impaired loans		24
Foreclosed real estate		203
Fair Value, Measurements, Nonrecurring [Member] | Land Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans		0
Foreclosed real estate		0
Fair Value, Measurements, Nonrecurring [Member] | Land Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans		0
Foreclosed real estate		0
Fair Value, Measurements, Nonrecurring [Member] | Land Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans		24
Foreclosed real estate		203
Fair Value, Measurements, Nonrecurring [Member] | Commercial Business Segment [Member]
Impaired loans	100	67
Fair Value, Measurements, Nonrecurring [Member] | Commercial Business Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Commercial Business Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Commercial Business Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans	100	67
Fair Value, Measurements, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]
Impaired loans	231	125
Fair Value, Measurements, Nonrecurring [Member] | Home Equity and Second Mortgage [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Home Equity and Second Mortgage [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Home Equity and Second Mortgage [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans	231	$ 125
Fair Value, Measurements, Nonrecurring [Member] | Other Consumer Loan [Member]
Impaired loans	14
Fair Value, Measurements, Nonrecurring [Member] | Other Consumer Loan [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans	0
Fair Value, Measurements, Nonrecurring [Member] | Other Consumer Loan [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans	0
Fair Value, Measurements, Nonrecurring [Member] | Other Consumer Loan [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans	$ 14