Other Income And Expenses	12 Months Ended
Mar. 31, 2013
Other Income and Expenses [Abstract]
Other Income and Other Expense Disclosure [Text Block]	12. Other Operating Income and Expense Other operating income in 2013 included a gain of $1,971,000 as a result of the estimated fair market value of the net assets acquired exceeding the purchase price of Sunnyside (see Note 2, Acquisitions). The Company also recorded a gain of $252,000 from the sale of property located in Cambria, Wisconsin and a net loss of $252,000 on the disposal of certain other fixed assets. Other operating income in 2012 included a gain of $665,000 from the sale of property located in LeSueur, MN and a gain of $149,000 from the sale of other property. Other operating income in 2011 included a gain of $736,000 as a result of the estimated fair market value of the net assets acquired exceeding the purchase price of Lebanon (see Note 2, Acquisitions). The Company also recorded a gain from the reversal of an environmental reserve of $250,000, a gain of $249,000 from the sale of certain fixed assets and a loss of $391,000 from the disposal of certain other fixed assets.

Other Income And Expenses

12 Months Ended

Mar. 31, 2013

Other Income and Expenses [Abstract]

Other Income and Other Expense Disclosure [Text Block]

12. Other Operating Income and Expense

Other operating income in 2013 included a gain of $1,971,000 as a result of the estimated fair market value of the net assets acquired exceeding the purchase price of Sunnyside (see Note 2, Acquisitions). The Company also recorded a gain of $252,000 from the sale of property located in Cambria, Wisconsin and a net loss of $252,000 on the disposal of certain other fixed assets.

Other operating income in 2012 included a gain of $665,000 from the sale of property located in LeSueur, MN and a gain of $149,000 from the sale of other property.

Other operating income in 2011 included a gain of $736,000 as a result of the estimated fair market value of the net assets acquired exceeding the purchase price of Lebanon (see Note 2, Acquisitions). The Company also recorded a gain from the reversal of an environmental reserve of $250,000, a gain of $249,000 from the sale of certain fixed assets and a loss of $391,000 from the disposal of certain other fixed assets.