Note I - Stockholders' Equity (Details Textual) - USD ($) $ in Millions				12 Months Ended
	Jan. 14, 2022	Mar. 12, 2021	Sep. 19, 2020	Jun. 30, 2022
Stock Repurchase Program, Additional Authorized Amount	$ 3.0	$ 3.0	$ 2.0
Stock Repurchase Program, Authorized Amount	$ 18.0	$ 15.0	$ 12.0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)				130,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Cashless Exercises (in shares)				120,000
Stock Issued During Period, Shares, Stock Options Exercised for Cash (in shares)				55,915
Restricted Stock [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total				$ 2.1
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				2 years 4 months 24 days