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Note 3 - Concentration of Credit Risk (Details Textual)	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017	Sep. 30, 2018 USD ($)	Sep. 30, 2017	Dec. 31, 2017 USD ($)
Cash, Uninsured Amount	$ 12,593,000		$ 12,593,000		$ 12,198,000
Export Sales To Unaffiliated Customers As Percentage Of Total Sales	10.00%
Number Of Major Customers	1	1
Accounts Receivable [Member]
Number Of Major Customers			3
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer A [Member]
Concentration Risk, Percentage	26.00%	59.00%	40.00%	65.00%

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- Definition

Export sales to unaffiliated customers as percentage of total sales.

+ References

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Number of major customers.

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- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

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- Definition

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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