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Note 13 - Subsequent Events (Details Textual)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 03, 2019
$ / shares
Dec. 04, 2018
USD ($)
Dec. 31, 2018
USD ($)
ft²
Nov. 25, 2018
$ / shares
Nov. 26, 2017
$ / shares
Nov. 25, 2018
$ / shares
Nov. 26, 2017
$ / shares
Common Stock, Dividends, Per Share, Declared | $ / shares       $ 0.10 $ 0.10 $ 0.30 $ 0.30
Subsequent Event [Member]              
Common Stock, Dividends, Per Share, Declared | $ / shares $ 4.25            
Dividends Payable, Date Declared Jan. 03, 2019            
Dividends Payable, Date to be Paid Feb. 26, 2019            
Dividends Payable, Date of Record Feb. 05, 2019            
Subsequent Event [Member] | Additional Manufacturing Facility [Member]              
Area of Land | ft²     90,000        
Construction in Progress Expenditures Incurred but Not yet Paid     $ 19,000        
Electronics Business [Member] | Discontinued Operations, Disposed of by Sale [Member] | Subsequent Event [Member]              
Disposal Group, Including Discontinued Operation, Consideration   $ 145,000          
Proceeds from Divestiture of Businesses   122,561          
Disposal Group, Including Discontinued Operation, Transaction Costs and Taxes   22,439          
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Total   $ 101,568