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Note 15 - Subsequent Events (Details Textual) - USD ($) |  |  | 1 Months Ended
--- | --- | --- | ---
May 15, 2018 | Mar. 06, 2018 | Aug. 08, 2019 | Jul. 31, 2019
Subsequent Event [Member] |  |  |  |
Payments to Acquire Marketable Securities, Total |  |  | $ 29,000,000 |
Common Class A [Member] |  |  |  |
Stock Issued During Period, Shares, New Issues | 3,137,768 | 3,300,000 |  |
Common Class A [Member] | Subsequent Event [Member] |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 334,751
Proceeds from Issuance of Common Stock, Net |  |  |  | $ 7,557,692

X
- Definition The cash inflow from the additional capital contribution to the entity, net of offering costs. + References No definition available. + Details
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X
- Definition Amount of cash outflow for purchase of marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 + Details
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- Definition Number of new stock issued during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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