Note 14 - Employee Benefits - Activities Under All Plans (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Weighted average exercise price (in dollars per share)	$ 11.21
Granted (in shares)	0	0
Shares available for grant (in shares)	318,040
Restricted Stock [Member]
Unvested restricted shares outstanding (in shares)	18,035
Share-Based Payment Arrangement, Option [Member]
Options outstanding (in shares)	34,229
The 2009 Plan [Member]
Shares available for grant (in shares)	0	0
Weighted average exercise price (in dollars per share)	$ 11.21	$ 11.21	$ 11.21
Shares available for grant (in shares)	0	0
The 2009 Plan [Member] | Restricted Stock [Member]
Unvested restricted shares outstanding (in shares)	0	0
Unvested restricted shares outstanding (in shares)	0	0
The 2009 Plan [Member] | Share-Based Payment Arrangement, Option [Member]
Options outstanding (in shares)	34,229	34,229
Options outstanding (in shares)	34,229	34,229
The 2017 Plan [Member]
Shares available for grant (in shares)	332,005	345,907
Vested (in shares)	0	0
Shares available for grant (in shares)	318,040	332,005
Options outstanding (in shares)	0
The 2017 Plan [Member] | Granted February 1, 2022 [Member]
Granted (in shares)		(11,286)
Granted, vesting period (Year)		3 years
The 2017 Plan [Member] | Granted April 26, 2022 [Member]
Granted (in shares)		(2,616)
Granted, vesting period (Year)		1 year
The 2017 Plan [Member] | Granted January 24, 2023 [Member]
Granted (in shares)	(9,843)
Granted, vesting period (Year)	3 years
The 2017 Plan [Member] | Granted April 25, 2023 [Member]
Granted (in shares)	(4,122)
Granted, vesting period (Year)	1 year
The 2017 Plan [Member] | Restricted Stock [Member]
Unvested restricted shares outstanding (in shares)	19,054	22,841
Vested (in shares)	(10,329)	(13,055)
Unvested restricted shares outstanding (in shares)	18,035	19,054
The 2017 Plan [Member] | Restricted Stock [Member] | Granted February 1, 2022 [Member]
Granted (in shares)		7,524
The 2017 Plan [Member] | Restricted Stock [Member] | Granted April 26, 2022 [Member]
Granted (in shares)		1,744
The 2017 Plan [Member] | Restricted Stock [Member] | Granted January 24, 2023 [Member]
Granted (in shares)	6,562
The 2017 Plan [Member] | Restricted Stock [Member] | Granted April 25, 2023 [Member]
Granted (in shares)	2,748
The 2017 Plan [Member] | Share-Based Payment Arrangement, Option [Member]
Options outstanding (in shares)	0	0
Vested (in shares)	0	0
Options outstanding (in shares)	0	0
The 2017 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Granted February 1, 2022 [Member]
Granted (in shares)		0
The 2017 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Granted April 26, 2022 [Member]
Granted (in shares)		0
The 2017 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Granted January 24, 2023 [Member]
Granted (in shares)	0
The 2017 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Granted April 25, 2023 [Member]
Granted (in shares)	0