Note 10 - Stock Compensation Plans - Status of Shares Under the RRP and Stock Incentive Plan (Details) - The RRP and Stock Incentive Plan [Member] - Restricted Stock [Member] - $ / shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Unvested at the beginning of the period (in shares)	28,266	38,887
Unvested at the beginning of the period, weighted average grant date fair value (in dollars per share)	$ 13.30	$ 13.30
Granted, number of shares (in shares)	0	0
Granted, weighted average grant date fair value (in dollars per share)	$ 0	$ 0
Vested, number of shares (in shares)	(9,421)	(9,421)
Vested, weighted average grant date fair value (in dollars per share)	$ 13.30	$ 13.30
Forfeited, number of shares (in shares)	0	(1,200)
Forfeited, weighted average grant date fair value (in dollars per share)	$ 0	$ 13.30
Unvested at the end of the period (in shares)	18,845	28,266
Unvested at the end of the period, weighted average grant date fair value (in dollars per share)	$ 13.30	$ 13.30