Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	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, 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	$ 0	1,032	0	$ 0	0	1,032
Issuance of common stock for restricted stock grants (in shares)	91,773			0
Issuance of common stock for restricted stock grants	$ 1	(1)	0	$ 0	0	$ 0
Treasury Stock Acquired, Shares (in shares)	0			463,081		463,081
Repurchase of common stock	$ 0	0	0	$ (4,140)	0	$ (4,140)
Unrealized gain resulting from change in fair value of derivative instruments, net of tax	0	0	0	0	(49)	(49)
Net income (loss)	$ 0	0	7,806	$ 0	0	$ 7,806
Issuance of common stock for stock option exercise (in shares)	38,325			0		110,000
Issuance of common stock for stock option exercise	$ 1	(1)	0	$ 0	0	$ 0
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
Compensation expense related to stock compensation plans	$ 0	334	0	$ 0	0	334
Issuance of common stock for restricted stock grants (in shares)	91,773			0
Issuance of common stock for restricted stock grants	$ 1	(1)	0	$ 0	0	$ 0
Treasury Stock Acquired, Shares (in shares)	0			44,132		44,132
Repurchase of common stock	$ 0	0	0	$ (639)	0	$ (639)
Unrealized gain resulting from change in fair value of derivative instruments, net of tax	0	0	0	0	1,925	1,925
Net income (loss)	$ 0	0	1,916	$ 0	0	$ 1,916
Issuance of common stock for stock option exercise (in shares)	7,883			0		10,000
Issuance of common stock for stock option exercise	$ 0	0	0	$ 0	0	$ 0
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 Jun. 30, 2021	9,004,365			2,567,797
Balance at Jun. 30, 2021	$ 88	29,456	66,949	$ (15,849)	(561)	80,083
Compensation expense related to stock compensation plans	$ 0	733	0	$ 0	0	733
Issuance of common stock for restricted stock grants (in shares)	126,850			0
Issuance of common stock for restricted stock grants	$ 1	(1)	0	$ 0	0	$ 0
Treasury Stock Acquired, Shares (in shares)	0			397,365		397,365
Repurchase of common stock	$ 0	0	0	$ (5,105)	0	$ (5,105)
Forfeiture of restricted stock (in shares)	0			19,832
Forfeiture of restricted stock	$ 0	0	0	$ 0	0	0
Unrealized gain resulting from change in fair value of derivative instruments, net of tax	0	0	0	0	1,759	1,759
Net income (loss)	$ 0	0	7,607	$ 0	0	$ 7,607
Issuance of common stock for stock option exercise (in shares)						0
Balance (in shares) at Mar. 31, 2022	9,131,215			2,984,994
Balance at Mar. 31, 2022	$ 89	30,188	74,556	$ (20,954)	1,198	$ 85,077
Balance (in shares) at Dec. 31, 2021	9,004,365			2,776,623
Balance at Dec. 31, 2021	$ 88	29,923	72,052	$ (18,386)	724	84,401
Compensation expense related to stock compensation plans	$ 0	266	0	$ 0	0	266
Issuance of common stock for restricted stock grants (in shares)	126,850			0
Issuance of common stock for restricted stock grants	$ 1	(1)	0	$ 0	0	$ 0
Treasury Stock Acquired, Shares (in shares)	0			206,971		206,971
Repurchase of common stock	$ 0	0	0	$ (2,568)	0	$ (2,568)
Forfeiture of restricted stock (in shares)	0			1,400
Forfeiture of restricted stock	$ 0	0	0	$ 0	0	0
Unrealized gain resulting from change in fair value of derivative instruments, net of tax	0	0	0	0	474	474
Net income (loss)	$ 0	0	2,504	$ 0	0	$ 2,504
Issuance of common stock for stock option exercise (in shares)						0
Balance (in shares) at Mar. 31, 2022	9,131,215			2,984,994
Balance at Mar. 31, 2022	$ 89	$ 30,188	$ 74,556	$ (20,954)	$ 1,198	$ 85,077