Income Taxes (Details Textual) (USD $)	3 Months Ended				6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2012	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes (Textual) [Abstract]
Tax amount	$ 200,000						$ 200,000
Percentage of federal taxable income							2.00%
Bonus depreciation allowance percentage							50.00%
Uncertain income tax position not recognized							less than 50%
Deferred tax liability								8,100,000
Valuation allowance	(48,258,000)						(48,258,000)	(60,019,000)
Total deferred tax assets	56,376,000						56,376,000	68,137,000
Deferred tax assets for net operating loss carry forward	40,639,000						40,639,000	45,927,000
Expiry of federal research credit								begin to expire in 2028
Research and development tax credits	2,168,000						2,168,000	1,944,000
Gain on sale of oilseed processing business		0	0	31,278,000,000	31,278,000	31,278,000	31,278,000	0	0
Tax benefits	704,000						704,000	705,000	0	0
Interest or penalties recognized	0
Federal [Member]
Operating Loss Carryforwards [Line Items]
Expiry of federal net operating loss carry-forward								begin to expire in 2026 unless utilized
Research credit								500,000
Net operating loss carryforward								100,400,000
State [Member]
Operating Loss Carryforwards [Line Items]
Expiry of federal net operating loss carry-forward								begin to expire in 2013 unless utilized
Research credit								2,400,000
Net operating loss carryforward									$ 93,200,000