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Note 1 - Organization, Description of Business and Summary of Significant Accounting Policies - Schedule of Third-party Payers as a Percentage of Total (Details) - Customer Concentration Risk [Member]	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenue from Contract with Customer Benchmark [Member]
Concentrations of credit risk	28.00%	48.00%	33.00%	47.00%
Revenue from Contract with Customer Benchmark [Member] | Medicare [Member]
Concentrations of credit risk	18.00%	26.00%	23.00%	24.00%
Revenue from Contract with Customer Benchmark [Member] | Johnson and Johnson Services Inc JJSI [Member]
Concentrations of credit risk		11.00%		12.00%
Revenue from Contract with Customer Benchmark [Member] | United Healthcare [Member]
Concentrations of credit risk	10.00%	11.00%	10.00%	11.00%
Accounts Receivable [Member] | Medicare [Member]
Concentrations of credit risk			11.00%		15.00%
Accounts Receivable [Member] | Johnson and Johnson Services Inc JJSI [Member]
Concentrations of credit risk					10.00%

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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-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
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-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
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-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

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