Note 6 - Term Debt - Future Contractual Maturities of Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
2018	$ 30,750
2019	1,000
2020	4,446
2021
2022
Thereafter	10,000
Total future maturities	30,000
Total future maturities	46,196
Federal Home Loan Bank Advances [Member]
2018	30,000
Total future maturities	30,000
Senior Notes [Member]
2018	750
2019	1,000
2020	4,446
2021
2022
Thereafter
Total future maturities	6,196
Subordinated Debt [Member]
2018
2019
2020
2021
2022
Thereafter	10,000
Total future maturities	$ 10,000