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Note 14 - Employee Retirement Plans (Details Textual) - USD ($)
6 Months Ended 12 Months Ended
Dec. 31, 2016
Jun. 30, 2019
Jul. 01, 2018
Jul. 02, 2017
Defined Contribution Plan Required Age Of Employees To Become Eligible To Participate   21 years    
Defined Contribution Plan Number Of Months Of Service Must Be Completed To Participate   30 days    
Defined Contribution Plan, Employer Discretionary Contribution Amount   $ 900,000 $ 0 $ 0
Defined Benefit Plan Participants Deferment Percentage Of Salary And Performance And Nonperformance Based Bonus   1.00%    
Interest Expense [Member]        
Deferred Compensation Arrangement With Individual Gain (Loss) On Investment   $ 700,000 800,000 1,000,000
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]        
Defined Benefit Plan Percentage Of Employer Matching Contribution On Deferrals Made By Each Participant 50.00%      
Deferred Compensation Arrangement with Individual, Recorded Liability   $ 11,800,000 $ 9,400,000  
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Maximum [Member]        
Defined Benefit Plan Participants Deferment Percentage Of Salary And Performance And Nonperformance Based Bonus   100.00%    
Defined Benefit Plan Employer Matching Contribution Per Participant Amount $ 2,500      
Deferred Compensation Arrangement with Individual, Contributions by Employer       $ 100,000