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Note 13 - Major Customers and Accounts Receivable (Details Textual)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017	Jun. 30, 2018 USD ($)	Jun. 30, 2017	Dec. 31, 2017 USD ($)
Allowance for Doubtful Accounts Receivable, Noncurrent	$ 1,000,000		$ 1,000,000		$ 1,000,000
Percentage of Remaining Balance Owned Reserved			58.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Concentration Risk, Number of Major Customers	2	3	2	3
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Two Customers [Member]
Concentration Risk, Percentage	34.00%		37.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Three Customers [Member]
Concentration Risk, Percentage		52.00%		44.00%
Customer Concentration Risk [Member] | Current Accounts Receivable [Member]
Concentration Risk, Number of Major Customers			4		1
Customer Concentration Risk [Member] | Current Accounts Receivable [Member] | Four Customers [Member]
Concentration Risk, Percentage			53.00%
Customer Concentration Risk [Member] | Current Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage					55.00%
Customer Concentration Risk [Member] | Non-current Accounts Receivable [Member]
Concentration Risk, Number of Major Customers			1		1
Customer Concentration Risk [Member] | Non-current Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage			100.00%		100.00%

X

- Definition

Represents the number of external customers that accounts for 10 percent or more of an entity's revenues or accounts receivable.

+ References

No definition available.

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- Definition

The percentage of remaining balance owned under the contract that has been reserved.

+ References

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- Definition

A valuation allowance for receivables due to an Entity for more than one year from the balance sheet date that are expected to be uncollectible.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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