Note 20 - Fair Values - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Securities available-for-sale	$ 256,928	$ 266,943
Fair Value, Measurements, Recurring [Member]
Total assets measured at fair value	256,928	266,943
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total assets measured at fair value
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total assets measured at fair value	256,928	266,943
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total assets measured at fair value
US Government Agencies Debt Securities [Member]
Securities available-for-sale	40,087	40,369
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Securities available-for-sale	40,087	40,369
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	40,087	40,369
US Government Agencies Debt Securities [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	50,530	78,844
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Securities available-for-sale	50,530	78,844
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	50,530	78,844
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]
Securities available-for-sale	138,503	114,592
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Securities available-for-sale	138,503	114,592
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	138,503	114,592
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale
Corporate Debt Securities [Member]
Securities available-for-sale	2,922	4,992
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Securities available-for-sale	2,922	4,992
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	2,922	4,992
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale
Commercial Mortgage Backed Securities [Member]
Securities available-for-sale	24,762	26,641
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Securities available-for-sale	24,762	26,641
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	24,762	26,641
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Securities available-for-sale	124	1,505
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	124	1,505
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale