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Note 3 - Revenue From Contracts With Customers (Details Textual)
$ in Thousands
9 Months Ended
Jul. 01, 2018
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings $ 0      
Contract with Customer, Asset, after Allowance for Credit Loss, Total   $ 0 $ 0  
Contract with Customer, Liability, Total   $ 600   $ 400
Number of Reportable Segments   2    
Prepaid Expenses and Other Current Assets [Member]        
Contract with Customer, Right to Recover Product, Total   $ 100 0  
Accrued Expenses [Member]        
Contract with Customer, Refund Liability, Total   $ 200 $ 300