Note 11 - Treasury Stock and Repurchase Program - Treasury Stock at Cost (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended
	Jan. 31, 2023	Dec. 31, 2022	Nov. 30, 2022	Jan. 31, 2023	Oct. 31, 2022	Jul. 31, 2022	Jan. 31, 2022	Oct. 31, 2021	Jul. 31, 2021
Balance, shares (in shares)			542,500	542,500		490,157
Balance, total average cost assigned			$ 13,449	$ 13,449		$ 9,967
Balance, average cost per share (in dollars per share)	$ 25.76			$ 25.76	$ 24.79
Balance, aggregate purchase price remaining under the program	$ 1,951	$ 2,007	$ 2,565	$ 1,951	$ 2,956
November 30, 2022 (in shares)	1,112	10,845	6,681
November 30, 2022	$ 56	$ 558	$ 391	1,005	1,100	$ 2,382	$ 805	$ 354	$ 163
November 30, 2022 (in dollars per share)	$ 49.96	$ 51.49	$ 58.52
November 30, 2022	$ 1,951	$ 2,007	$ 2,565	$ 1,951	$ 2,956
Balance, shares (in shares)	561,138			561,138	542,500
Balance, total average cost assigned	$ 14,454			$ 14,454	$ 13,449