Note 15 - Income Taxes (Details Textual) - shares	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Schedule of Income Taxes [Line Items]
Operating loss carryforwards limitations minimum ownership change percentage	50.00%		50.00%
Operating loss carryforwards limitations ownership change period			3 years
Protective amendment limiting transfer of common stock affecting ownership percentage			10.00%
Stockholders percentage of outstanding common stock ownership percentage			10.00%
U.S. corporate income tax rate	21.00%	21.00%	21.00%	21.00%
Minimum [Member]
Schedule of Income Taxes [Line Items]
Protective amendment limiting transfer of common stock additional shares acquired	1,000,000		1,000,000
Additional common stock shares acquired	1,000,000		1,000,000

Common stock shares acquired.

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Net operating losses and tax credit carryforwards limitations minimum ownership change percentage.

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Net operating losses and tax credit carryforwards limitations ownership change period.

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Protective amendment limiting transfer of common stock additional shares acquired.

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Protective amendment limiting transfer of common stock affecting ownership percentage.

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Schedule of income taxes.

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Stockholders percentage of outstanding common stock ownership percentage.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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