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Note 9 - Concentration of Credit Risk (Details Textual) - Customer Concentration Risk [Member] | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($)
Revenue Benchmark [Member] |  |  |  |
Number of Major Customers | 2 | 2 | 2 | 2
Revenue Benchmark [Member] | Customer One [Member] |  |  |  |
Concentration Risk, Percentage | 34.00% | 30.00% | 25.00% | 24.00%
Revenue Benchmark [Member] | Customer Two [Member] |  |  |  |
Concentration Risk, Percentage | 22.00% | 23.00% | 27.00% | 27.00%
Accounts Receivable [Member] | Customer One [Member] |  |  |  |
Accounts Receivable, before Allowance for Credit Loss | $ 2,488,000 | $ 4,808,000 | $ 2,488,000 | $ 4,808,000
Concentration Risk, Percentage |  |  | 30.00% | 57.00%
Accounts Receivable [Member] | Customer Two [Member] |  |  |  |
Accounts Receivable, before Allowance for Credit Loss | $ 1,044,000 | $ 1,524,000 | $ 1,044,000 | $ 1,524,000
Concentration Risk, Percentage |  |  | 12.00% | 18.00%

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- 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. + Details
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- 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=121593590&loc=d3e4428-111522 + Details
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 2: 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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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