CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Shares	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Jun. 30, 2019		14,700	17,042,132
Beginning Balance at Jun. 30, 2019	$ 157,494	$ 15	$ 17,042	$ 57,912	$ 146,177	$ (63,652)
Net income (loss)	4,654				4,654
Unrealized losses on cash flow hedges, net of reclassifications to earnings	(1,301)					(1,301)
ESOP compensation expense, including reclassifications (in shares)			52,534
ESOP compensation expense, including reclassifications	860		$ 53	807
Share based compensation	$ (1)			(1)
Stock option exercises (in shares)	0		532
Cumulative preferred dividends, undeclared and unpaid	$ (137)				(137)
Ending Balance (in shares) at Sep. 30, 2019		14,700	17,095,198
Ending Balance at Sep. 30, 2019	161,569	$ 15	$ 17,095	58,718	150,694	(64,953)
Beginning Balance (in shares) at Jun. 30, 2019		14,700	17,042,132
Beginning Balance at Jun. 30, 2019	157,494	$ 15	$ 17,042	57,912	146,177	(63,652)
Net income (loss)	(27,369)
Change in funded status of retiree benefit obligations, net of tax	5,712
Ending Balance (in shares) at Mar. 31, 2020		14,700	17,231,473
Ending Balance at Mar. 31, 2020	147,736	$ 15	$ 17,234	61,027	118,394	(48,934)
Beginning Balance (in shares) at Sep. 30, 2019		14,700	17,095,198
Beginning Balance at Sep. 30, 2019	161,569	$ 15	$ 17,095	58,718	150,694	(64,953)
Net income (loss)	7,754				7,754
Unrealized losses on cash flow hedges, net of reclassifications to earnings	15,945					15,945
ESOP compensation expense, including reclassifications (in shares)			55,623
ESOP compensation expense, including reclassifications	581		$ 56	525
Share based compensation	319			319
Stock option exercises (in shares)			26,627
Stock option exercises	130		$ 29	101
Cumulative preferred dividends, undeclared and unpaid	(138)				(138)
Ending Balance (in shares) at Dec. 31, 2019		14,700	17,177,448
Ending Balance at Dec. 31, 2019	186,160	$ 15	$ 17,180	59,663	158,310	(49,008)
Net income (loss)	(39,777)				(39,777)
Unrealized losses on cash flow hedges, net of reclassifications to earnings	(5,638)					(5,638)
Change in funded status of retiree benefit obligations, net of tax	5,712					5,712
Share based compensation	908			854
Stock option exercises (in shares)			0
Stock option exercises	510		$ 0	510
Cumulative preferred dividends, undeclared and unpaid	(139)				(139)
Ending Balance (in shares) at Mar. 31, 2020		14,700	17,231,473
Ending Balance at Mar. 31, 2020	147,736	$ 15	$ 17,234	61,027	118,394	(48,934)
Beginning Balance (in shares) at Jun. 30, 2020		14,700	17,347,774
Beginning Balance at Jun. 30, 2020	111,913	$ 15	$ 17,348	62,043	108,536	(76,029)
Net income (loss)	(6,270)				(6,270)
Unrealized losses on cash flow hedges, net of reclassifications to earnings	4,271					4,271
Change in funded status of retiree benefit obligations, net of tax						(7,289)
ESOP compensation expense, including reclassifications (in shares)			76,671
ESOP compensation expense, including reclassifications	400		$ 77	323
Share based compensation	$ 745			745
Stock option exercises (in shares)	0		7,370
Stock option exercises			$ 7	(7)
Cumulative preferred dividends, undeclared and unpaid	$ (142)				(142)
Ending Balance (in shares) at Sep. 30, 2020		14,700	17,431,815
Ending Balance at Sep. 30, 2020	103,628	$ 15	$ 17,432	63,104	102,124	(79,047)
Beginning Balance (in shares) at Jun. 30, 2020		14,700	17,347,774
Beginning Balance at Jun. 30, 2020	111,913	$ 15	$ 17,348	62,043	108,536	(76,029)
Net income (loss)	(37,680)
Change in funded status of retiree benefit obligations, net of tax	(1,105)
Ending Balance (in shares) at Mar. 31, 2021		14,700	17,771,241
Ending Balance at Mar. 31, 2021	81,989	$ 15	$ 17,771	65,170	70,428	(71,395)
Beginning Balance (in shares) at Sep. 30, 2020		14,700	17,431,815
Beginning Balance at Sep. 30, 2020	103,628	$ 15	$ 17,432	63,104	102,124	(79,047)
Net income (loss)	(17,725)				(17,725)
Unrealized losses on cash flow hedges, net of reclassifications to earnings	3,455					3,455
Change in funded status of retiree benefit obligations, net of tax						6,184
ESOP compensation expense, including reclassifications (in shares)			108,426
ESOP compensation expense, including reclassifications	395		$ 108	287
Share based compensation	399			399
Stock option exercises (in shares)			50,843
Stock option exercises	0		$ 51	(51)
Cumulative preferred dividends, undeclared and unpaid	(143)				(143)
Ending Balance (in shares) at Dec. 31, 2020		14,700	17,591,084
Ending Balance at Dec. 31, 2020	96,193	$ 15	$ 17,591	63,739	84,256	(69,408)
Net income (loss)	(13,684)
Unrealized losses on cash flow hedges, net of reclassifications to earnings	(1,987)
Change in funded status of retiree benefit obligations, net of tax	0
ESOP compensation expense, including reclassifications	931
Share based compensation	680
Cumulative preferred dividends, undeclared and unpaid	(144)
Ending Balance (in shares) at Mar. 31, 2021		14,700	17,771,241
Ending Balance at Mar. 31, 2021	$ 81,989	$ 15	$ 17,771	$ 65,170	$ 70,428	$ (71,395)