Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Treasury Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Jun. 30, 2019							8,851,677			1,626,605
Balance (Accounting Standards Update 2016-02 [Member]) at Jun. 30, 2019			$ 318			$ 318
Balance at Jun. 30, 2019							$ 87	$ 26,280	$ 57,380	$ (7,955)	$ 292	$ 76,084
Issuance of common stock for restricted stock grants (in shares)							5,000
Issuance of common stock for restricted stock grants
Compensation expense related to stock compensation plans								1,712				1,712
Treasury Stock Acquired, Shares (in shares)										462,700
Repurchase of common stock										$ (3,747)		(3,747)
Forfeiture of restricted stock (in shares)										15,000
Forfeiture of restricted stock
Reclassification pursuant to adoption of ASU 2018-02 (Note A)									128		(128)
Change in minimum pension liability, net of tax											(323)	(323)
Unrealized gain (loss) resulting from change in fair value of derivative instruments, net of tax											(1,024)	(1,024)
Net income (loss)									(1,645)			(1,645)
Balance (in shares) at Jun. 30, 2020							8,856,677			2,104,305
Balance at Jun. 30, 2020							$ 87	27,992	56,181	$ (11,702)	(1,183)	71,375
Issuance of common stock for restricted stock grants (in shares)							91,773
Issuance of common stock for restricted stock grants							$ 1	(1)
Compensation expense related to stock compensation plans								1,430				1,430
Treasury Stock Acquired, Shares (in shares)										433,050
Repurchase of common stock										$ (3,844)		(3,844)
Change in minimum pension liability, net of tax											350	350
Unrealized gain (loss) resulting from change in fair value of derivative instruments, net of tax											272	272
Net income (loss)									10,768			$ 10,768
Issuance of common stock for stock option exercise (in shares)							55,915			30,442		130,000
Issuance of common stock for stock option exercise								35		$ (303)		$ (268)
Balance (in shares) at Jun. 30, 2021							9,004,365			2,567,797
Balance at Jun. 30, 2021							$ 88	$ 29,456	$ 66,949	$ (15,849)	$ (561)	$ 80,083