Note 8 - Fair Values Measurement - Financial Assets Measured at the Fair Value on Recurring and Non-recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2013 |
Securities available for sale | $ 154,993 | $ 152,790 | $ 152,790 |
Recorded investment, total | 8,273 | 15,131 | |
Fair Value, Measurements, Recurring [Member] | | | |
Securities available for sale | 154,993 | 152,790 | |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | | |
Securities available for sale | | | |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | | | |
Securities available for sale | 154,993 | 152,790 | |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | | | |
Securities available for sale | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Portfolio Segment [Member] | Impaired Loans [Member] | | | |
Recorded investment, total | 87 | 87 | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] | | | |
Recorded investment, total | 87 | 87 | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Construction Loans [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Farmland Loans [Member] | | | |
Recorded investment, total | | 585 | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Nonfarm Nonresidential [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] | Construction Loans [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] | Farmland Loans [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] | Nonfarm Nonresidential [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] | Construction Loans [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] | Farmland Loans [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] | Nonfarm Nonresidential [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Construction Loans [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Farmland Loans [Member] | | | |
Recorded investment, total | | 585 | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Nonfarm Nonresidential [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Real Estate Owned [Member] | Construction Loans [Member] | | | |
Other real-estate | 6,298 | 6,571 | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Real Estate Owned [Member] | Farmland Loans [Member] | | | |
Other real-estate | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Real Estate Owned [Member] | Nonfarm Nonresidential [Member] | | | |
Other real-estate | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member] | Construction Loans [Member] | | | |
Other real-estate | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member] | Farmland Loans [Member] | | | |
Other real-estate | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member] | Nonfarm Nonresidential [Member] | | | |
Other real-estate | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member] | Construction Loans [Member] | | | |
Other real-estate | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member] | Farmland Loans [Member] | | | |
Other real-estate | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member] | Nonfarm Nonresidential [Member] | | | |
Other real-estate | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] | Construction Loans [Member] | | | |
Other real-estate | 6,298 | 6,571 | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] | Farmland Loans [Member] | | | |
Other real-estate | | | |
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] | Nonfarm Nonresidential [Member] | | | |
Other real-estate | | | |
Fair Value, Measurements, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Impaired Loans [Member] | Multifamily Loans [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Impaired Loans [Member] | One- to Four-family Residential Properties [Member] | | | |
Recorded investment, total | 988 | 1,261 | |
Fair Value, Measurements, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] | Multifamily Loans [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] | One- to Four-family Residential Properties [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] | Multifamily Loans [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] | One- to Four-family Residential Properties [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Multifamily Loans [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] | One- to Four-family Residential Properties [Member] | | | |
Recorded investment, total | 988 | 1,261 | |
Fair Value, Measurements, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Other Real Estate Owned [Member] | Multifamily Loans [Member] | | | |
Other real-estate | | | |
Fair Value, Measurements, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Other Real Estate Owned [Member] | One- to Four-family Residential Properties [Member] | | | |
Other real-estate | 20 | 250 | |
Fair Value, Measurements, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member] | Multifamily Loans [Member] | | | |
Other real-estate | | | |
Fair Value, Measurements, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member] | One- to Four-family Residential Properties [Member] | | | |
Other real-estate | | | |
Fair Value, Measurements, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member] | Multifamily Loans [Member] | | | |
Other real-estate | | | |
Fair Value, Measurements, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member] | One- to Four-family Residential Properties [Member] | | | |
Other real-estate | | | |
Fair Value, Measurements, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] | Multifamily Loans [Member] | | | |
Other real-estate | | | |
Fair Value, Measurements, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] | One- to Four-family Residential Properties [Member] | | | |
Other real-estate | 20 | 250 | |
Fair Value, Measurements, Nonrecurring [Member] | Consumer Portfolio Segment [Member] | Impaired Loans [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Consumer Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Consumer Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Consumer Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Agriculture Portfolio Segment [Member] | Impaired Loans [Member] | | | |
Recorded investment, total | | 59 | |
Fair Value, Measurements, Nonrecurring [Member] | Agriculture Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Agriculture Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Agriculture Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] | | | |
Recorded investment, total | | 59 | |
Fair Value, Measurements, Nonrecurring [Member] | Other Portfolio Segment [Member] | Impaired Loans [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Other Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Other Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] | | | |
Recorded investment, total | | | |
Fair Value, Measurements, Nonrecurring [Member] | Other Portfolio Segment [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] | | | |
Recorded investment, total | | | |
US Treasury and Government [Member] | | | |
Securities available for sale | 32,722 | 34,099 | |
US Treasury and Government [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Securities available for sale | 32,722 | 34,099 | |
US Treasury and Government [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | | |
Securities available for sale | | | |
US Treasury and Government [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | | | |
Securities available for sale | 32,722 | 34,099 | |
US Treasury and Government [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | | | |
Securities available for sale | | | |
Residential Mortgage Backed Securities [Member] | | | |
Securities available for sale | 96,076 | 102,353 | |
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Securities available for sale | 96,076 | 102,353 | |
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | | |
Securities available for sale | | | |
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | | | |
Securities available for sale | 96,076 | 102,353 | |
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | | | |
Securities available for sale | | | |
Collateralized Debt Obligations [Member] | | | |
Securities available for sale | 21,361 | 11,203 | |
Collateralized Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Securities available for sale | 21,361 | 11,203 | |
Collateralized Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | | |
Securities available for sale | | | |
Collateralized Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | | | |
Securities available for sale | 21,361 | 11,203 | |
Collateralized Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | | | |
Securities available for sale | | | |
US States and Political Subdivisions Debt Securities [Member] | | | |
Securities available for sale | 1,667 | 2,045 | |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Securities available for sale | 1,667 | 2,045 | |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | | |
Securities available for sale | | | |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | | | |
Securities available for sale | 1,667 | 2,045 | |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | | | |
Securities available for sale | | | |
Corporate Debt Securities [Member] | | | |
Securities available for sale | 3,167 | 3,090 | |
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | | | |
Securities available for sale | 3,167 | 3,090 | |
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | | |
Securities available for sale | | | |
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | | | |
Securities available for sale | 3,167 | 3,090 | |
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | | | |
Securities available for sale | | | |