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Note 10 - Borrowings - Maturity of Borrowings (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Jun. 29, 2018	Dec. 22, 2016
2020	$ 10,199,000
2021	12,202,000
2022	206,000
2023	60,210,000
2024	30,376,000
Thereafter	18,248,000
Total contractual maturities of borrowings	131,441,000
Unamortized debt issuance costs	(541,000)
Balance of borrowings at December 31, 2019	130,900,000	$ 131,000,000
Federal Home Loan Bank Advances [Member]
2020	10,000,000
2021
2022
2023	60,000,000
2024	30,000,000
Thereafter
Total contractual maturities of borrowings	100,000,000
Unamortized debt issuance costs
Balance of borrowings at December 31, 2019	100,000,000
Senior Notes [Member]
2020
2021	12,000,000
2022
2023
2024
Thereafter
Total contractual maturities of borrowings	12,000,000
Unamortized debt issuance costs	(147,000)	(222,000)		$ (374,000)
Balance of borrowings at December 31, 2019	11,853,000
Subordinated Debt [Member]
2020
2021
2022
2023
2024
Thereafter	10,000,000
Total contractual maturities of borrowings	10,000,000
Unamortized debt issuance costs	(248,000)	(277,000)	$ (291,000)
Balance of borrowings at December 31, 2019	9,752,000
Junior Subordinated Debt [Member]
2020
2021
2022
2023
2024
Thereafter	8,248,000
Total contractual maturities of borrowings	8,248,000
Unamortized debt issuance costs	(146,000)	(154,000)
Balance of borrowings at December 31, 2019	8,102,000
Notes Payable, Other Payables [Member]
2020	199,000
2021	202,000
2022	206,000
2023	210,000
2024	376,000
Thereafter
Total contractual maturities of borrowings	1,193,000	$ 1,400,000
Unamortized debt issuance costs
Balance of borrowings at December 31, 2019	$ 1,193,000