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The percentage of product revenue.

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The percentage of product revenue out of total revenues.

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Note 2 - Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2019 USD ($)
Allowance for Doubtful Accounts Receivable, Ending Balance	$ 7	$ 0
Selling, General and Administrative Expense, Total	8,122,000	7,471,000	$ 8,965,000
Deferred Tax Assets, Valuation Allowance, Total	$ 110,854,000	$ 107,379,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Operating Leases, Future Minimum Payments Due, Total	$ 2,287,000
Percentage of Product Revenue	100.00%	100.00%	100.00%
Percentage of Product Revenue Out of Total Revenues	72.00%	76.00%	71.00%
Notes 2017 [Member] \| New Accounting Pronouncement, Early Adoption, Effect [Member]
Increase (Decrease) in Restricted Cash, Total		$ 2,600,000
Accounting Standards Update 2016-02 [Member] \| Minimum [Member] \| Scenario, Forecast [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ 1,000,000
Accounting Standards Update 2016-02 [Member] \| Maximum [Member] \| Scenario, Forecast [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ 1,500,000
Patent-Related Legal Expenses [Member]
Selling, General and Administrative Expense, Total	$ 200,000	$ 300,000	$ 200,000
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Eco-Energy, LLC [Member]
Number of Customer	1
Concentration Risk, Percentage	66.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| C&N Ethanol Marketing, LLC [Member]
Number of Customer		1
Concentration Risk, Percentage		78.00%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Eco-Energy, LLC [Member]
Concentration Risk, Percentage	72.00%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| C&N Ethanol Marketing, LLC [Member]
Concentration Risk, Percentage		76.00%	71.00%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Purina Animal Nutrition, LLC [Member]
Concentration Risk, Percentage	21.00%	17.00%	17.00%