Condensed Consolidated Statement of Shareowners' Equity (unaudited) Statement - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance at the beginning of the period at Jun. 30, 2019	$ 216,490		$ 12	$ 2,139	$ 3,570	$ 277,391		$ 1,937	$ (68,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	31,874					31,874
Other comprehensive income (loss)	213							213
Issuance of non-restricted stock (11,000 shares in Q2'21, 6,000 shares in Q2'20, 24,000 shares YTD in FY'21, 15,000 shares YTD in FY'20)	0				(281)				281
Conversion of Class A to Class B common stock (1,000 shares in Q2'21, 55,000 shares in Q2'20, 1,000 shares YTD in FY'21, 57,000 shares YTD in FY'20)	0		(2)	2	(21)				21
Compensation expense related to stock compensation plans	4,395				4,395
Performance share issuance (0 shares in Q2'21, 0 shares in Q2'20, 0 shares YTD in FY'21, 67,000 shares YTD in FY'20)	(512)				(1,391)				879
Restricted stock units issuance (0 shares in Q2'21, 0 shares in Q2'20, 15,000 shares YTD in FY'21, 0 shares YTD in FY'20)	(125)				(327)				202
Relative total shareholder return performance units issuance (0 shares in Q2'21, 0 shares in Q2'20, 32,000 shares YTD in FY'21, 48,000 shares YTD in FY'20)	(330)				(954)				624
Reclassification of equity-classified awards	(680)				(680)
Repurchase of Common Stock (62,000 shares in Q2'21, 65,000 shares in Q2'20, 62,000 shares YTD in FY'21, 65,000 shares YTD in FY'20)	(3,004)								(3,004)
Dividends declared ($0.09 per share in Q2'21, $0.09 per share in Q2'20, $0.18 per share YTD in FY'21, $0.18 per share YTD in FY'20)	(10,071)					(10,071)
Balance at the end of the period at Mar. 31, 2020	238,250		10	2,141	4,311	299,194		2,150	(69,556)
Balance at the beginning of the period at Dec. 31, 2019	232,589		10	2,141	3,423	293,089		2,120	(68,194)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	9,451					9,451
Other comprehensive income (loss)	30							30
Issuance of non-restricted stock (11,000 shares in Q2'21, 6,000 shares in Q2'20, 24,000 shares YTD in FY'21, 15,000 shares YTD in FY'20)	0				(79)				79
Conversion of Class A to Class B common stock (1,000 shares in Q2'21, 55,000 shares in Q2'20, 1,000 shares YTD in FY'21, 57,000 shares YTD in FY'20)	0				(21)				21
Compensation expense related to stock compensation plans	1,315				1,315
Restricted stock units issuance (0 shares in Q2'21, 0 shares in Q2'20, 15,000 shares YTD in FY'21, 0 shares YTD in FY'20)	(125)				(327)				202
Repurchase of Common Stock (62,000 shares in Q2'21, 65,000 shares in Q2'20, 62,000 shares YTD in FY'21, 65,000 shares YTD in FY'20)	(1,664)								(1,664)
Dividends declared ($0.09 per share in Q2'21, $0.09 per share in Q2'20, $0.18 per share YTD in FY'21, $0.18 per share YTD in FY'20)	(3,346)					(3,346)
Balance at the end of the period at Mar. 31, 2020	238,250		10	2,141	4,311	299,194		2,150	(69,556)
Balance at the beginning of the period at Jun. 30, 2020	244,796	$ 134	10	2,141	3,770	305,024	$ 134	2,137	(68,286)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	19					19
Other comprehensive income (loss)	75							75
Issuance of non-restricted stock (11,000 shares in Q2'21, 6,000 shares in Q2'20, 24,000 shares YTD in FY'21, 15,000 shares YTD in FY'20)	(24)				(511)				487
Conversion of Class A to Class B common stock (1,000 shares in Q2'21, 55,000 shares in Q2'20, 1,000 shares YTD in FY'21, 57,000 shares YTD in FY'20)	0		(1)	1
Compensation expense related to stock compensation plans	4,048				4,048
Restricted stock units issuance (0 shares in Q2'21, 0 shares in Q2'20, 15,000 shares YTD in FY'21, 0 shares YTD in FY'20)	(80)				(284)				204
Relative total shareholder return performance units issuance (0 shares in Q2'21, 0 shares in Q2'20, 32,000 shares YTD in FY'21, 48,000 shares YTD in FY'20)	(156)				(586)				430
Repurchase of Common Stock (62,000 shares in Q2'21, 65,000 shares in Q2'20, 62,000 shares YTD in FY'21, 65,000 shares YTD in FY'20)	(2,192)								(2,192)
Dividends declared ($0.09 per share in Q2'21, $0.09 per share in Q2'20, $0.18 per share YTD in FY'21, $0.18 per share YTD in FY'20)	(10,161)					(10,161)
Balance at the end of the period at Mar. 31, 2021	236,459		9	2,142	6,437	295,016		2,212	(69,357)
Balance at the beginning of the period at Dec. 31, 2020	244,012		9	2,142	4,843	302,937		2,169	(68,088)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(4,529)					(4,529)
Other comprehensive income (loss)	43							43
Issuance of non-restricted stock (11,000 shares in Q2'21, 6,000 shares in Q2'20, 24,000 shares YTD in FY'21, 15,000 shares YTD in FY'20)	(24)				(196)				172
Conversion of Class A to Class B common stock (1,000 shares in Q2'21, 55,000 shares in Q2'20, 1,000 shares YTD in FY'21, 57,000 shares YTD in FY'20)	0
Compensation expense related to stock compensation plans	1,790				1,790
Repurchase of Common Stock (62,000 shares in Q2'21, 65,000 shares in Q2'20, 62,000 shares YTD in FY'21, 65,000 shares YTD in FY'20)	(1,441)								(1,441)
Dividends declared ($0.09 per share in Q2'21, $0.09 per share in Q2'20, $0.18 per share YTD in FY'21, $0.18 per share YTD in FY'20)	(3,392)					(3,392)
Balance at the end of the period at Mar. 31, 2021	$ 236,459		$ 9	$ 2,142	$ 6,437	$ 295,016		$ 2,212	$ (69,357)