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Commitments and Contingencies (Product Warranties) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Commitments And Contingencies Product Warranties Details        
Balance at beginning of period $ 340 $ 342 $ 326 $ 339
Accruals for warranties 113 77 227 175
Settlements (88) (70) (175) (153)
Adjustments (32) (24) (45) (36)
Balance at end of period $ 333 $ 325 $ 333 $ 325