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Note 9 - Concentration of Credit Risk (Details Textual) - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Revenue Benchmark [Member]
Number of Major Customers	2	2	2	2
Revenue Benchmark [Member] | Customer One [Member]
Concentration Risk, Percentage	21.00%	21.00%	24.00%	23.00%
Revenue Benchmark [Member] | Customer Two [Member]
Concentration Risk, Percentage	18.00%	23.00%	25.00%	26.00%
Accounts Receivable [Member] | Customer One [Member]
Accounts Receivable, before Allowance for Credit Loss	$ 1,777,000	$ 2,241,000	$ 1,777,000	$ 2,241,000
Concentration Risk, Percentage			22.00%	27.00%
Accounts Receivable [Member] | Customer Two [Member]
Accounts Receivable, before Allowance for Credit Loss	$ 996,000	$ 1,702,000	$ 996,000	$ 1,702,000
Concentration Risk, Percentage			12.00%	21.00%

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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X

- Definition

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

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X

- 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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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-Topic 825
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