Condensed Consolidated Statements of Stockholders' Equity (unaudited) (USD $) In Thousands	Common Class A [Member]	Common Class B [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Jun. 30, 2011	$ 5,933	$ 801	$ 51,411	$ 96,477	$ (1,961)	$ 152,661
Net earnings				3,964		3,964
Other comprehensive income (loss)					(11,254)	(11,254)
Dividends ($0.20 per share)				(1,350)		(1,350)
Issuance of stock under ESOP	17		159			176
Issuance of stock under ESPP		9	72			81
Stock-based compensation			81			81
Conversion	27	(27)
Balance at Dec. 31, 2011	5,977	783	51,723	99,091	(13,215)	144,359
Balance at Jun. 30, 2012	6,017	753	51,941	94,661	(25,534)	127,838
Translation loss					(15,437)
Pension and postretirement plans net of taxes					(9,652)
					(25,089)	(25,089)
Net earnings				125		125
Other comprehensive income (loss)					445	445
Dividends ($0.20 per share)				(1,359)		(1,359)
Purchase of stock	(5)		(57)			(62)
Issuance of stock under ESOP	14		148			162
Issuance of stock under ESPP		14	94			108
Stock-based compensation			96			96
Conversion	25	(25)
Balance at Dec. 31, 2012	$ 6,051	$ 742	$ 52,222	$ 93,427	$ (25,089)	$ 127,353