Note J - Income Taxes (Details Textual) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Jun. 30, 2018
Effective Income Tax Rate Reconciliation, Percent, Total	25.10%	204.00%
Increase (Decrease) in Income Tax Expense Due to Changes in Enacted Tax Rate	$ 4,526
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	727.90%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%		35.00%
Transitional Income Tax , Amount	$ 0
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1,092
Foreign Tax Authority [Member]
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount		$ 3,803
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent		611.50%
Increase (Decrease) in Income Tax Expense Due to Changes in Enacted Tax Rate	$ 431
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	69.30%
Open Tax Year	2011 2012 2013 2014 2015 2016 2017 2018
State and Local Jurisdiction [Member]
Open Tax Year	2015 2016 2017 2018
State and Local Jurisdiction [Member] | Wisconsin Department of Revenue [Member]
Open Tax Year	2010 2011 2012 2013