Note I - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2022	Mar. 31, 2022	Mar. 31, 2021	Jun. 30, 2021
Effective Income Tax Rate Reconciliation, Percent, Total	21.40%	19.30%			22.20%	10.50%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent					21.00%		21.00%
Effective Income Tax Rate Reconciliation, Global Intangible Low-taxed Income, Amount			$ 400
Income Tax Benefit Cares Act						$ 300
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 0			$ 0