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Note 7 - Related Party Transactions (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Multi Channel Systems MCS GmbH [Member]        
Operating Leases, Rent Expense, Net, Total $ 0.1 $ 0.1 $ 0.2 $ 0.2