Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Revenue Recognition (Details Textual)

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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