Note 15 - Fair Value - Fair Value of Assets on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Available for sale securities	$ 43,751	$ 58,012
Fair Value, Measurements, Recurring [Member]
Available for sale securities	43,751	58,012
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Available for sale securities
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities	43,751	58,012
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Available for sale securities
Fair Value, Measurements, Recurring [Member] | US Government Corporations and Agencies Securities [Member]
Available for sale securities	1,307	2,220
Fair Value, Measurements, Recurring [Member] | US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available for sale securities
Fair Value, Measurements, Recurring [Member] | US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities	1,307	2,220
Fair Value, Measurements, Recurring [Member] | US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available for sale securities
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Available for sale securities	8,295	13,137
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available for sale securities
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities	8,295	13,137
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available for sale securities
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]
Available for sale securities	28,536	33,467
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available for sale securities
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities	28,536	33,467
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available for sale securities
Fair Value, Measurements, Recurring [Member] | Certificates of Deposit [Member]
Available for sale securities	1,446	3,997
Fair Value, Measurements, Recurring [Member] | Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
Available for sale securities
Fair Value, Measurements, Recurring [Member] | Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities	1,446	3,997
Fair Value, Measurements, Recurring [Member] | Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]
Available for sale securities
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Available for sale securities	4,167	5,191
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available for sale securities
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities	4,167	5,191
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available for sale securities