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Note 13 - Significant Risks and Uncertainties (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Cash, Uninsured Amount	$ 20,157,000	$ 11,966,000
Export Sales To Unaffiliated Customers As Percentage Of Total Sales	11.90%	9.00%
Number Of Major Customers	1	1
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer A [Member]
Concentration Risk, Percentage	45.30%	49.60%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer B [Member]
Concentration Risk, Percentage		13.70%

X

- 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.

+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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