Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - 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			$ 420			$ 420
Balance at Jun. 30, 2019							$ 87	$ 26,280	$ 57,380	$ (7,955)	$ 292	$ 76,084
Repurchase of common stock (in shares)										159,668
Repurchase of common stock										$ (1,332)		$ (1,332)
Issuance of common stock for stock option exercise (in shares)												0
Issuance of common stock for stock option exercise
Unrealized loss resulting from change in fair value of derivative instruments, net of tax											(516)	(516)
Net income									572			572
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								892				892
Balance (in shares) at Dec. 31, 2019							8,856,677			1,801,273
Balance at Dec. 31, 2019							$ 87	27,172	58,500	$ (9,287)	(352)	76,120
Forfeiture of restricted stock (in shares)										15,000
Forfeiture of restricted stock
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect									128		(128)
Balance (in shares) at Sep. 30, 2019							8,851,677			1,643,322
Balance at Sep. 30, 2019							$ 87	26,713	58,024	$ (7,970)	551	77,405
Repurchase of common stock (in shares)										157,951
Repurchase of common stock										$ (1,317)		$ (1,317)
Issuance of common stock for stock option exercise (in shares)												0
Unrealized loss resulting from change in fair value of derivative instruments, net of tax											(903)	$ (903)
Net income									476			476
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								459				459
Balance (in shares) at Dec. 31, 2019							8,856,677			1,801,273
Balance at Dec. 31, 2019							$ 87	27,172	58,500	$ (9,287)	(352)	76,120
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect
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
Compensation expense related to stock compensation plans								698				698
Repurchase of common stock (in shares)										418,949
Repurchase of common stock										$ (3,501)		$ (3,501)
Issuance of common stock for stock option exercise (in shares)							30,442					100,000
Issuance of common stock for stock option exercise							$ 1	(1)
Unrealized loss resulting from change in fair value of derivative instruments, net of tax											(1,974)	(1,974)
Net income									5,890			5,890
Balance (in shares) at Dec. 31, 2020							8,887,119			2,523,254
Balance at Dec. 31, 2020							$ 88	28,689	62,071	$ (15,203)	(3,157)	72,488
Balance (in shares) at Sep. 30, 2020							8,856,677			2,340,387
Balance at Sep. 30, 2020							$ 87	28,353	58,439	$ (13,445)	(2,303)	71,131
Compensation expense related to stock compensation plans								337				337
Repurchase of common stock (in shares)										182,867
Repurchase of common stock										$ (1,758)		$ (1,758)
Issuance of common stock for stock option exercise (in shares)							30,442					100,000
Issuance of common stock for stock option exercise							$ 1	(1)
Unrealized loss resulting from change in fair value of derivative instruments, net of tax											(854)	(854)
Net income									3,632			3,632
Balance (in shares) at Dec. 31, 2020							8,887,119			2,523,254
Balance at Dec. 31, 2020							$ 88	$ 28,689	$ 62,071	$ (15,203)	$ (3,157)	$ 72,488