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Note 18 - Acquisitions (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Apr. 03, 2017
Jul. 01, 2017
Mar. 31, 2019
Mar. 31, 2018
Apr. 02, 2017
Apr. 30, 2014
Business Combination, Bargain Purchase, Gain Recognized, Amount     $ 1,786,000    
Truitt Bros. Inc. [Member]            
Business Acquisition, Percentage of Voting Interests Acquired 50.00%          
Business Combination, Bargain Purchase, Gain Recognized, Amount $ 1,800     1,800,000    
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain       $ 900,000    
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement of Inventory, Impact on Cost of Goods Sold   $ 500,000        
Business Combination, Consideration Transferred, Total 14,400,000          
Cash Acquired from Acquisition 3,000,000          
Equity Method Investments 34,900,000       $ 17,400,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt 3,600,000          
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination, Total $ 31,800,000          
Truitt Bros. Inc. Investment [Member]            
Equity Method Investment, Ownership Percentage           50.00%
Equity Method Investment, Aggregate Cost           $ 16,200,000
Purchase Agreement, Additional Percentage of Voting Interests Acquirable           50.00%