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Note 4 - Revenue Recognition (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2019 | Jun. 30, 2019
Contract with Customer, Liability, Total |  | $ 45,900,000 | $ 45,900,000 | $ 56,700,000
Contract with Customer, Liability, Revenue Recognized |  | $ 7,000,000 | $ 53,600,000 |
Annual Fee Per Member [Member] |  |  |  |
Membership, Annual Fee Amount Per Member | $ 100 |  |  |
Contract with Customer, Satisfaction of Performance Obligation Period | 1 year |  |  |

X
- Definition Represents the satisfaction of performance obligation period to transfer good or service to customer for which consideration from customer has been received or is due. + References No definition available. + Details
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- Definition The annual fee amount per member of membership program. + References No definition available. + Details
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Period Type: | instant

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044 + Details
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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