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Note 6 - Investments (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 30, 2018
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2016
Dec. 31, 2018
Investment Income, Interest   $ 4      
Payments to Acquire Equity Method Investments   345    
Equity Method Investments   5,278    
Virtual Power Systems [Member]          
Equity Method Investment, Ownership Percentage 21.40%        
Payments to Acquire Equity Method Investments $ 300        
Equity Method Investment, Summarized Financial Information, Assets, Total 2,500        
Equity Method Investment, Summarized Financial Information, Liabilities, Total $ 1,800        
Equity Method Investments   5,300      
Virtual Power Systems [Member]          
Payments to Acquire Notes Receivable         $ 700
Interest Rate on Convertible Note Receivable         2.00%
Test Products International Inc. [Member]          
Equity Method Investment, Ownership Percentage       8.50%  
Notes Receivable, Related Parties   300   $ 400 $ 300
Interest Rate on Note Receivable       5.00%  
Financing Receivable, Allowance for Credit Loss, Current   $ 0