Note 6 - Stock Compensation Plan - Summary of Nonvested Restricted Stock Awards (Details) - Restricted Stock [Member]	9 Months Ended
	Sep. 30, 2022 $ / shares shares
Nonvested (in shares) | shares	52,200
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 28.32
Granted (in shares) | shares	0
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 0
Vested (in shares) | shares	0
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 0
Forfeited (in shares) | shares	(1,250)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	$ 28.92
Nonvested (in shares) | shares	50,950
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 28.31