Supplementary Quarterly Financial Information (Details) - USD ($)	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales	$ 100,207,000	$ 111,542,000	$ 118,352,000	$ 113,487,000	$ 113,093,000	$ 126,861,000	$ 129,392,000	$ 119,834,000	$ 443,588,000	$ 489,180,000	$ 468,764,000
Gross margin	5,347,000	21,328,000	21,474,000	21,791,000	17,044,000	27,632,000	27,402,000	26,140,000	69,940,000	98,219,000	108,651,000
Environmental remediation						(3,600,000)				(3,600,000)
Gain on sale of facility								1,835,000		1,835,000
ERP impairment	(2,605,000)	(18,668,000)							(21,273,000)	0	0
Restructuring expense	(10,048,000)								(10,048,000)
Litigation settlement reimbursements (costs)	(475,000)
Net income (loss)	$ (19,916,000)	$ (15,552,000)	$ 1,566,000	$ 1,296,000	$ 2,186,000	$ 3,079,000	$ 6,221,000	$ 6,180,000	$ (32,605,000)	$ 17,666,000	$ 23,786,000
Earnings per share: Basic	$ (2.52)	$ (1.97)	$ 0.20	$ 0.16	$ 0.28	$ 0.39	$ 0.79	$ 0.79	$ (4.13)	$ 2.25	$ 3.06
Earnings per share: Diluted	$ (2.52)	$ (1.97)	$ 0.20	$ 0.16	$ 0.28	$ 0.39	$ 0.78	$ 0.78	$ (4.13)	$ 2.23	$ 3.02
Immaterial Error Related To Variable Consideration Provided To Customers [Member] | Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales					$ (4,400,000)