Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of the Provision (Benefit) for Income Taxes (Detail)

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Income Taxes - Reconciliation of the Provision (Benefit) for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]      
Provision (benefit) for income taxes at federal rate $ 486 $ (30) $ (3,958)
State taxes 120 45 118
Charges not deductible for income tax purposes 55 89 48
Research and development tax credits (211) (177) (102)
Valuation allowance 411 3,877 (80)
Difference in federal rate (1) 3 (2,799)
Impairment of goodwill and intangible assets   257 1,760
Foreign-derived intangible income deduction (95) (69)  
Capital loss from sale of Energy Steel (325) (3,848)  
Stranded tax effects in accumulated other comprehensive loss     1,828
Mandatory repatriation of post-1986 undistributed foreign subsidiary earnings and profits     185
Other   16 (10)
Total provision (benefit) for income taxes $ 440 $ 163 $ (3,010)