Note 13 - Fair Value and Interest Rate Risk - Financial Assets and Liabilities (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Fair value, total	$ 108,612,000	$ 49,262,000
SBA servicing assets	417,000
Reported Value Measurement [Member]
Financial assets, total	908,216,000	826,476,000
Financial liabilities, total	883,196,000	808,228,000
Estimate of Fair Value Measurement [Member]
Financial assets, total	907,579,000	823,887,000
Financial liabilities, total	889,774,000	817,066,000
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member] | Brokered Deposits [Member]
Deposits	12,836,000	41,287,000
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member] | Cash and Due from Banks [Member]
Cash and cash equivalents	2,397,000	3,006,000
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member] | Interest-bearing Deposits [Member]
Cash and cash equivalents	113,794,000	31,630,000
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Brokered Deposits [Member]
Deposits	12,967,000	41,643,000
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Cash and Due from Banks [Member]
Cash and cash equivalents	2,397,000	3,006,000
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Interest-bearing Deposits [Member]
Cash and cash equivalents	113,794,000	31,630,000
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]
Fair value, total	108,612,000	49,262,000
Other investments	4,450,000	4,450,000
Federal Reserve Bank stock	2,744,000	2,783,000
Federal Home Loan Bank stock	4,185,000	4,503,000
Loans held for sale	2,636,000	1,217,000
Other Real Estate Owned	1,216,000	1,906,000
Accrued interest receivable	6,207,000	6,620,000
FHLB borrowings	90,000,000	90,000,000
Senior notes	11,965,000	11,927,000
Subordinated debt	9,796,000	9,782,000
Junior subordinated debt owed to unconsolidated trust	8,114,000	8,110,000
Accrued interest payable	337,000	572,000
Interest rate swap liability	893,000	1,187,000
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Demand Deposits [Member]
Deposits	218,374,000	158,676,000
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Savings Deposits [Member]
Deposits	99,264,000	98,635,000
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Money Market Deposits [Member]
Deposits	178,249,000	146,389,000
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Negotiable Order of Withdrawal (NOW) Accounts [Member]
Deposits	36,085,000	30,529,000
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Time Deposits [Member]
Deposits	216,390,000	210,140,000
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]
Interest rate swap	893,000	1,187,000
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Interest rate swap	168,000	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Fair value, total	108,612,000	49,262,000
Other investments	4,450,000	4,450,000
Federal Reserve Bank stock	2,744,000	2,783,000
Federal Home Loan Bank stock	4,185,000	4,503,000
Loans held for sale	2,952,000	1,343,000
Other Real Estate Owned	1,216,000	1,906,000
Accrued interest receivable	6,207,000	6,620,000
FHLB borrowings	95,677,000	97,293,000
Senior notes	12,018,000	12,028,000
Subordinated debt	10,053,000	10,125,000
Junior subordinated debt owed to unconsolidated trust	8,114,000	8,110,000
Accrued interest payable	337,000	572,000
Interest rate swap liability	893,000	1,187,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Demand Deposits [Member]
Deposits	218,374,000	158,676,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Savings Deposits [Member]
Deposits	99,264,000	98,635,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Money Market Deposits [Member]
Deposits	178,249,000	146,389,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Negotiable Order of Withdrawal (NOW) Accounts [Member]
Deposits	36,085,000	30,529,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Time Deposits [Member]
Deposits	216,866,000	210,882,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member]
Interest rate swap	893,000	1,187,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Interest rate swap	168,000	0
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]
Loans receivable, net	660,534,000	719,596,000
SBA servicing assets	380,000	316,000
Note payable	893,000	994,000
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Loans receivable, net	659,544,000	716,822,000
SBA servicing assets	417,000	375,000
Note payable	$ 877,000	$ 997,000