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
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								1,351				1,351
Repurchase of common stock (in shares)										423,676
Repurchase of common stock										$ (3,482)		$ (3,482)
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											(181)	$ (181)
Net income (loss)									(3,443)			(3,443)
Balance (in shares) at Mar. 31, 2020							8,856,677			2,065,281
Balance at Mar. 31, 2020							$ 87	27,631	54,485	$ (11,437)	(17)	70,749
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 Dec. 31, 2019							8,856,677			1,801,273
Balance at Dec. 31, 2019							$ 87	27,172	58,500	$ (9,287)	(352)	76,120
Compensation expense related to stock compensation plans								459				459
Repurchase of common stock (in shares)										264,008
Repurchase of common stock										$ (2,150)		$ (2,150)
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											335	$ 335
Net income (loss)									(4,015)			(4,015)
Balance (in shares) at Mar. 31, 2020							8,856,677			2,065,281
Balance at Mar. 31, 2020							$ 87	27,631	54,485	$ (11,437)	(17)	70,749
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
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								1,032				1,032
Repurchase of common stock (in shares)										463,081
Repurchase of common stock										$ (4,140)		$ (4,140)
Issuance of common stock for stock option exercise (in shares)							38,325					110,000
Issuance of common stock for stock option exercise							$ 1	(1)
Unrealized loss resulting from change in fair value of derivative instruments, net of tax											(49)	(49)
Net income (loss)									7,806			7,806
Balance (in shares) at Mar. 31, 2021							8,986,775			2,567,386
Balance at Mar. 31, 2021							$ 89	29,022	63,987	$ (15,842)	(1,232)	76,024
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
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								334				334
Repurchase of common stock (in shares)										44,132
Repurchase of common stock										$ (639)		$ (639)
Issuance of common stock for stock option exercise (in shares)							7,883					10,000
Issuance of common stock for stock option exercise
Unrealized loss resulting from change in fair value of derivative instruments, net of tax											1,925	1,925
Net income (loss)									1,916			1,916
Balance (in shares) at Mar. 31, 2021							8,986,775			2,567,386
Balance at Mar. 31, 2021							$ 89	$ 29,022	$ 63,987	$ (15,842)	$ (1,232)	$ 76,024