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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($)
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Unrecognized tax benefits [Roll Forward]      
Balance at beginning of period $ 1,092,000 $ 1,181,000 $ 1,117,000
Additions based on tax positions related to the current year 234,000 141,000 57,000
Additions for tax positions of prior year 0 106,000 217,000
Reductions for tax positions of prior year (107,000) 0 (210,000)
Settlements 0 (336,000) 0
Balance at end of period 1,219,000 1,092,000 1,181,000
Unrecognized tax benefits that would impact effective tax rate 1,054,000 840,000 678,000
Recognized interest and penalties 5,000 51,000 $ 34,000
Interest and penalties accrued $ 146,000 $ 141,000