Note 3 - Revenue From Contracts With Customers (Details Textual) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)
Contract with Customer, Asset, after Allowance for Credit Loss, Total	$ 0	$ 0
Contract with Customer, Liability, Total	$ 400	$ 400
Number of Reportable Segments	2	2
Prepaid Expenses and Other Current Assets [Member]
Contract with Customer, Right to Recover Product, Total	$ 100	$ 100
Accrued Expenses [Member]
Contract with Customer, Refund Liability, Total	$ 200	$ 200