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Note 8 - Concentration of Credit Risk (Details Textual)	3 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Customer One [Member]
Accounts Receivable, Gross	$ 3,643,000	$ 3,301,000
Customer Two [Member]
Accounts Receivable, Gross	$ 2,657,000	$ 2,657,000
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Number of Major Customers	2	2
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer One [Member]
Concentration Risk, Percentage	31.80%	28.80%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer Two [Member]
Concentration Risk, Percentage	17.70%	17.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer One [Member]
Concentration Risk, Percentage	33.40%	27.70%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Two [Member]
Concentration Risk, Percentage	24.30%	22.30%

X

- Definition

Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc.

+ References

No definition available.

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- Definition

For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(9))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 210
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-Section S99
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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
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-Name Accounting Standards Codification
-Topic 275
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