Note 8 - Fair Value Disclosure - Estimated Fair Value of the Company's Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Securities available-for-sale, fair value	$ 169,124	$ 194,675
Reported Value Measurement [Member]
Securities available-for-sale, fair value	171,411	197,385
Estimate of Fair Value Measurement [Member]
Securities available-for-sale, fair value	171,411	197,385
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]
Interest Bearing	64,004	68,798
Non-Interest Bearing	14,095	11,419
Accrued Interest Receivable	3,274	3,297
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Interest Bearing	64,004	68,798
Non-Interest Bearing	14,095	11,419
Accrued Interest Receivable	3,274	3,297
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]
Loans, Net	962,328	942,629
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Loans, Net	1,004,210	961,110
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]
Restricted Stock	3,590	3,656
Bank-Owned Life Insurance	24,361	24,222
Deposits	1,106,640	1,118,359
Short-term Borrowings	34,967	30,571
Other Borrowed Funds	11,000	14,000
Accrued Interest Payable	863	987
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Restricted Stock	3,590	3,656
Bank-Owned Life Insurance	24,361	24,222
Deposits	1,116,037	1,128,078
Short-term Borrowings	34,967	30,571
Other Borrowed Funds	11,206	15,380
Accrued Interest Payable	$ 863	$ 987