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
Beginning balance (in shares) at Jun. 30, 2017	7,981,677			1,044,659
Beginning balance at Jun. 30, 2017	$ 79	$ 22,260	$ 45,788	$ (6,074)	$ (905)	$ 61,148
Issuance of common stock for stock option exercise (in shares)						0
Issuance of common stock for restricted stock grants (in shares)	675,000
Issuance of common stock for restricted stock grants	$ 6	(6)
Compensation expense related to stock compensation plans		1,578				1,578
Repurchase of common stock (in shares)				43,201
Repurchase of common stock				$ (505)		(505)
Unrealized gain resulting from change in fair value of derivative instruments, net of tax					(1,550)	(1,550)
Net income			2,167			2,167
Ending balance (in shares) at Mar. 31, 2018	8,656,667			1,087,860
Ending balance at Mar. 31, 2018	$ 85	23,832	47,955	$ (6,579)	(2,455)	$ 62,838
Beginning balance at Dec. 31, 2017					(2,236)
Issuance of common stock for stock option exercise (in shares)						0
Unrealized gain resulting from change in fair value of derivative instruments, net of tax						$ (219)
Net income						2,051
Ending balance (in shares) at Mar. 31, 2018	8,656,667			1,087,860
Ending balance at Mar. 31, 2018	$ 85	23,832	47,955	$ (6,579)	(2,455)	62,838
Beginning balance (in shares) at Jun. 30, 2018	8,656,677			1,098,268
Beginning balance at Jun. 30, 2018	$ 85	24,486	50,839	$ (6,584)	(578)	$ 68,248
Issuance of common stock for stock option exercise (in shares)	5,000					5,000
Issuance of common stock for stock option exercise		38				$ 38
Issuance of common stock for restricted stock grants (in shares)	190,000
Issuance of common stock for restricted stock grants	$ 2	(2)
Compensation expense related to stock compensation plans		1,291				1,291
Repurchase of common stock (in shares)				89,353
Repurchase of common stock				$ (941)		(941)
Forfeiture of restricted stock (in shares)				405,000
Forfeiture of restricted stock		4		$ (4)
Unrealized gain resulting from change in fair value of derivative instruments, net of tax					1,659	1,659
Net income			6,734			6,734
Ending balance (in shares) at Mar. 31, 2019	8,851,677			1,592,621
Ending balance at Mar. 31, 2019	$ 87	25,817	57,573	$ (7,529)	1,081	$ 77,029
Beginning balance at Dec. 31, 2018					657
Issuance of common stock for stock option exercise (in shares)						0
Unrealized gain resulting from change in fair value of derivative instruments, net of tax						$ 424
Net income						1,994
Ending balance (in shares) at Mar. 31, 2019	8,851,677			1,592,621
Ending balance at Mar. 31, 2019	$ 87	$ 25,817	$ 57,573	$ (7,529)	$ 1,081	$ 77,029