Note 15 - Fair Value Measurements and Fair Value of Financial Instruments - Schedule of Carrying Value and Fair Value by Fair Value Hierarchy of Financial Instruments (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Measurements, Recurring [Member]
Liabilities, fair value	$ 416,000	$ 7,175,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, fair value
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, fair value
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, fair value	416,000	7,175,000
Fair Value, Measurements, Recurring [Member] | Warrant [Member]
Derivative liability, fair value	22,000	1,951,000
Fair Value, Measurements, Recurring [Member] | Warrant [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative liability, fair value
Fair Value, Measurements, Recurring [Member] | Warrant [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative liability, fair value
Fair Value, Measurements, Recurring [Member] | Warrant [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative liability, fair value	22,000	1,951,000
Fair Value, Measurements, Recurring [Member] | Embedded Derivative [Member]
Derivative liability, fair value	394,000	5,224,000
Fair Value, Measurements, Recurring [Member] | Embedded Derivative [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative liability, fair value
Fair Value, Measurements, Recurring [Member] | Embedded Derivative [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative liability, fair value
Fair Value, Measurements, Recurring [Member] | Embedded Derivative [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative liability, fair value	394,000	5,224,000
Fair Value, Measurements, Nonrecurring [Member]
Assets, fair value	1,047,000	1,916
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, fair value	29,000	189
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value	1,018,000	1,727
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, fair value
Fair Value, Measurements, Nonrecurring [Member] | Corn and Finished Goods Inventory [Member]
Corn and finished goods inventory, fair value	1,047,000	1,916,000
Fair Value, Measurements, Nonrecurring [Member] | Corn and Finished Goods Inventory [Member] | Fair Value, Inputs, Level 1 [Member]
Corn and finished goods inventory, fair value	29,000	189,000
Fair Value, Measurements, Nonrecurring [Member] | Corn and Finished Goods Inventory [Member] | Fair Value, Inputs, Level 2 [Member]
Corn and finished goods inventory, fair value	1,018,000	1,727,000
Fair Value, Measurements, Nonrecurring [Member] | Corn and Finished Goods Inventory [Member] | Fair Value, Inputs, Level 3 [Member]
Corn and finished goods inventory, fair value