Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Reduction in Board of Directors Fees in Response to COVID19 Outbreak, Percentage	25.00%
Reduction in Salaries of Chief Executive Officer, President, Chief Operating Officer and Some Managers in Response to COVID 19 Outbreak, Percentage	25.00%
Reduction in Salaries of Employees and Furloughs in Response to COVID 19 Outbreak, Percentage of Workforce	42.00%
Accounts Receivable, Allowance for Credit Loss, Current	$ 937,000		$ 1,354,000
Accounts Receivable, Credit Loss Expense (Reversal)	590,000	$ 98,000
Accounts Receivable, Allowance for Credit Loss, Writeoff	$ 1,007,000

Represents reduction in board of directors fees in response to COVID 19 Outbreak represented as percentage.

No definition available.

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- Definition

Represents reduction in salaries of Chief Executive Officer, President, Chief Operating Officer and some managers in response to COVID 19 Outbreak represented as percentage.

+ References

No definition available.

+ Details

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- Definition

Represents reduction in salaries of employees and furloughs in response to COVID 19 outbreak represented as percentage of workforce.

+ References

No definition available.

+ Details

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- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446

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Balance Type:	credit
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- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

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Balance Type:	debit
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- Definition

Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(5))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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