Consolidated Balance Sheets - Scenario, Unspecified [Domain] - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2014
Common Class A [Member]
Stockholders’ equity:
Common stock	$ 6,224	$ 6,166
Common Class B [Member]
Stockholders’ equity:
Common stock	789	795
Cash	11,108	16,233
Short-term investments	7,855	8,723
Accounts receivable (less allowance for doubtful accounts of $612 and $704, respectively)	40,311	43,712
Inventories	63,003	65,582
Current deferred tax asset	4,554	6,037
Prepaid expenses and other current assets	6,582	6,615
Total current assets	133,413	146,902
Property, plant and equipment, net	44,413	51,537
Taxes receivable	3,383	3,775
Deferred tax assets, net	18,803	16,537
Intangible assets, net	7,125	7,760
Goodwill	3,034	3,034
Other assets	2,101	1,898
Total assets	212,272	231,443
Notes payable and current maturities of long-term debt	1,552	10,548
Accounts payable	9,471	9,980
Accrued expenses	7,011	8,516
Accrued compensation	5,565	6,642
Total current liabilities	23,599	35,686
Deferred tax liabilities	1,548	2,037
Other tax obligations	4,607	3,013
Long-term debt, net of current portion	18,552	10,804
Postretirement benefit and pension obligations	49,536	43,589
Total liabilities	97,842	95,129
Additional paid-in capital	54,869	54,063
Retained earnings	98,164	95,715
Accumulated other comprehensive loss	(45,616)	(20,425)
Total stockholders’ equity	114,430	136,314
Total liabilities and stockholders’ equity	$ 212,272	$ 231,443