Note 15. Earnings Per Share - Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Dividends Declared, Basic									$ 7,371	$ 7,337	$ 7,331
Unvested Participating Dividends									0	0	(9)
Dividends to Common Share Owners, Basic									7,371	7,337	7,322
Undistributed Earnings (Loss), Basic									4,263	(2,415)	3,472
Earnings (Loss) Allocated to Participating Securities									0	0	(4)
Undistributed Earnings (Loss) Allocated to Common Share Owners, Basic									4,263	(2,415)	3,468
Average Basic Common Shares Outstanding									37,881	37,726	37,459
Dividends Declared and Assumed Dividends on Dilutive Shares									7,408	7,364	7,349
Unvested Participating Dividends, Diluted									0	0	(9)
Dividends and Assumed Dividends to Common Share Owners									7,408	7,364	7,340
Undistributed Earnings (Loss), Diluted									4,226	(2,442)	3,454
Earnings (Loss) Allocated to Participating Securities									0	0	(4)
Undistributed Earnings (Loss) Allocated to Common Share Owners, Diluted									4,226	(2,442)	3,450
Average Diluted Common Shares Outstanding									38,087	37,873	37,561
Income (Loss) Used for Basic EPS Calculation									11,634	4,922	10,790
Assumed Dividends Payable on Dilutive Shares, Performance Shares									37	27	18
Increase (Reduction) of Undistributed Earnings (Loss) - allocated based on Class A and Class B shares, Performance Shares									(37)	(27)	(18)
Income (Loss) Used for Diluted EPS Calculation									11,634	4,922	10,790
Average Shares Outstanding for Basic EPS Calculation									37,881	37,726	37,459
Dilutive Effect of Average Outstanding Performance Shares									206	147	102
Average Shares Outstanding for Diluted EPS Calculation									38,087	37,873	37,561
Class A Common Stock
Dividends Declared, Basic									1,869	1,889	1,955
Unvested Participating Dividends									0	0	(9)
Dividends to Common Share Owners, Basic									1,869	1,889	1,946
Undistributed Earnings (Loss) Allocated to Common Share Owners, Basic									1,169	(672)	990
Average Basic Common Shares Outstanding									10,387	10,493	10,694
Basic Earnings (Loss) Per Share	$ 0.16	$ 0.06	$ 0.08	$ (0.01)	$ 0.00	$ 0.08	$ 0.02	$ 0.01	$ 0.29	$ 0.12	$ 0.27
Dividends Declared and Assumed Dividends on Dilutive Shares									1,906	1,916	1,972
Unvested Participating Dividends, Diluted									0	0	(9)
Dividends and Assumed Dividends to Common Share Owners									1,906	1,916	1,963
Undistributed Earnings (Loss) Allocated to Common Share Owners, Diluted									1,175	(686)	991
Average Diluted Common Shares Outstanding									10,593	10,639	10,791
Diluted Earnings (Loss) Per Share	$ 0.16	$ 0.06	$ 0.08	$ (0.01)	$ 0.00	$ 0.08	$ 0.02	$ 0.01	$ 0.29	$ 0.12	$ 0.27
Income (Loss) Used for Basic EPS Calculation									3,038	1,217	2,936
Assumed Dividends Payable on Dilutive Shares, Performance Shares									37	27	17
Increase (Reduction) of Undistributed Earnings (Loss) - allocated based on Class A and Class B shares, Performance Shares									6	(14)	1
Income (Loss) Used for Diluted EPS Calculation									3,081	1,230	2,954
Average Shares Outstanding for Basic EPS Calculation									10,387	10,493	10,694
Dilutive Effect of Average Outstanding Performance Shares									206	146	97
Average Shares Outstanding for Diluted EPS Calculation									10,593	10,639	10,791
Class B Common Stock
Dividends Declared, Basic									5,502	5,448	5,376
Unvested Participating Dividends									0	0	0
Dividends to Common Share Owners, Basic									5,502	5,448	5,376
Undistributed Earnings (Loss) Allocated to Common Share Owners, Basic									3,094	(1,743)	2,478
Average Basic Common Shares Outstanding									27,494	27,233	26,765
Basic Earnings (Loss) Per Share	$ 0.16	$ 0.07	$ 0.09	$ 0.00	$ 0.01	$ 0.09	$ 0.02	$ 0.01	$ 0.31	$ 0.14	$ 0.29
Dividends Declared and Assumed Dividends on Dilutive Shares									5,502	5,448	5,377
Unvested Participating Dividends, Diluted									0	0	0
Dividends and Assumed Dividends to Common Share Owners									5,502	5,448	5,377
Undistributed Earnings (Loss) Allocated to Common Share Owners, Diluted									3,051	(1,756)	2,459
Average Diluted Common Shares Outstanding									27,494	27,234	26,770
Diluted Earnings (Loss) Per Share	$ 0.16	$ 0.07	$ 0.09	$ 0.00	$ 0.01	$ 0.09	$ 0.02	$ 0.01	$ 0.31	$ 0.14	$ 0.29
Income (Loss) Used for Basic EPS Calculation									8,596	3,705	7,854
Assumed Dividends Payable on Dilutive Shares, Performance Shares									0	0	1
Increase (Reduction) of Undistributed Earnings (Loss) - allocated based on Class A and Class B shares, Performance Shares									(43)	(13)	(19)
Income (Loss) Used for Diluted EPS Calculation									$ 8,553	$ 3,692	$ 7,836
Average Shares Outstanding for Basic EPS Calculation									27,494	27,233	26,765
Dilutive Effect of Average Outstanding Performance Shares									0	1	5
Average Shares Outstanding for Diluted EPS Calculation									27,494	27,234	26,770