Note 11 - Treasury Stock - Repurchases of Common Stock (Details) - $ / shares	1 Months Ended				4 Months Ended
	Jan. 31, 2022	Dec. 31, 2021	Nov. 30, 2021	Oct. 31, 2021	Jan. 31, 2022
Approximate dollar value of shares that may yet be purchased under the plans or programs (in shares)	1,008,444	1,871,840	2,322,674	2,505,216	1,008,444
Publicly Announced Share Repurchase Program [Member]
Total number of shares purchased (in shares)	97,956	56,447	21,350	58,528	234,281
Treasury Stock [Member]
Total number of shares purchased (in shares)	97,956	56,447	21,350	58,528	234,281
Average price paid per share (in dollars per share)	$ 8.81	$ 7.99	$ 8.55	$ 8.45