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Note 4 - Revenue Recognition (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Inventory, Net, Total $ 501,684 $ 546,959
Accounting Standards Update 2014-09 [Member]    
Inventory, Net, Total   36,900
Contract with Customer, Liability, Total   $ 52,300