Note J - Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Sep. 25, 2018	Jun. 30, 2020	Jun. 30, 2019
Stock Issued During Period, Shares, New Issues (in shares)	1,533,334
Share Price (in dollars per share)	$ 22.50
Payments of Stock Underwriting Costs	$ 2,070
Payments of Stock Offering Expenses	220
Proceeds from Issuance of Common Stock	$ 32,210		$ 32,210
Common Stock, Shares, Outstanding, Ending Balance (in shares)		13,405,993	13,240,278
Treasury Stock, Shares, Ending Balance (in shares)		1,226,809	1,392,524
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)		186,226	157,043
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)		20,511	3,784
Treasury Stock, Shares, Acquired (in shares)		0	0
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares)		315,000	315,000
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)		$ 0	$ 0
Preferred Stock, Shares Authorized (in shares)		200,000	200,000
Preferred Stock, Shares Issued, Total (in shares)		0	0
Preferred Stock, Capital Shares Reserved for Future Issuance (in shares)		150,000