Debt (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Debt	$ 135,536,000	$ 136,767,000
Agribusiness term loan
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Line of credit, amount outstanding	82,042,000	83,533,000
Agribusiness working capital debt
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.00%
Line of credit, amount outstanding	4,750,000	4,750,000
Other agribusiness debt
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.99%
Line of credit, amount outstanding	151,000	159,000
Swiss debt | 3.7% Loan Due in 2014
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.70%
Line of credit, amount outstanding	14,139,000	14,012,000
Swiss debt | 3.8% Loan Due in 2014
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.80%
Line of credit, amount outstanding		3,363,000
Mortgage debt | 3.9% to 4.75% Loan Due Through 2014
Debt Instrument [Line Items]
Mortgages	23,629,000	17,307,000
Mortgage debt | 5% to 5.5% Loan Due from 2014 to 2016
Debt Instrument [Line Items]
Mortgages	8,676,000	11,491,000
Mortgage debt | 6% to 6.5% Loan Due Through 2036
Debt Instrument [Line Items]
Mortgages	545,000	548,000
Mortgage debt | 10% Loan Due Through 2013
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	10.00%
Mortgages	1,604,000	1,604,000
Real Estate Operations
Debt Instrument [Line Items]
Unused borrowing capacity	27,300,000
Agribusiness Operations
Debt Instrument [Line Items]
Unused borrowing capacity	$ 22,300,000
Minimum | Mortgage debt | 3.9% to 4.75% Loan Due Through 2014
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.90%
Minimum | Mortgage debt | 5% to 5.5% Loan Due from 2014 to 2016
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.00%
Minimum | Mortgage debt | 6% to 6.5% Loan Due Through 2036
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.00%
Maximum | Mortgage debt | 3.9% to 4.75% Loan Due Through 2014
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Maximum | Mortgage debt | 5% to 5.5% Loan Due from 2014 to 2016
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.50%
Maximum | Mortgage debt | 6% to 6.5% Loan Due Through 2036
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.50%
June 30, 2014 | Line of Credit
Debt Instrument [Line Items]
Debt Instrument, Covenant Terms, Debt Service Coverage Ratio, Maximum	1.40
September 30, 2014 | Line of Credit
Debt Instrument [Line Items]
Debt Instrument, Covenant Terms, Debt Service Coverage Ratio, Maximum	1.50
Beyond September 30, 2014 | Line of Credit
Debt Instrument [Line Items]
Debt Instrument, Covenant Terms, Debt Service Coverage Ratio, Maximum	1.75