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Note 10 - Concentration of Credit Risk (Details Textual) - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Revenue Benchmark [Member]
Number of Major Customers			1	1
Revenue Benchmark [Member] | Customer One [Member]
Concentration Risk, Percentage	63.00%	25.00%	50.00%	37.00%
Accounts Receivable [Member] | Customer One [Member]
Accounts Receivable, before Allowance for Credit Loss	$ 1,724,000	$ 831,000	$ 1,724,000	$ 831,000
Concentration Risk, Percentage			33.00%	16.00%

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=121593590&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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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