Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020
Total available-for-sale debt securities and equity securities
Amortized Cost	$ 3,941		$ 9,551
Gross Unrealized Gains	101		238
Fair Value	4,042		9,789
Proceeds from sales or maturities of available-for-sale investment and equity securities
Proceeds from sales or maturities of available-for-sale investment securities and equity securities	5,781	$ 19,817
Gross gains	176	228
Net realized gains on sales of available-for-sale investment securities and equity securities	176	$ 228
Time deposits. | Current
Debt securities
Time deposits	3,307		3,927
Time deposits-current	3,307		3,927
Mutual funds | Current
Equity securities
Amortized Cost	633		5,623
Gross Unrealized Gains	95		235
Fair Value	728		5,858
Equity shares/ options | Noncurrent
Equity securities
Amortized Cost	1		1
Gross Unrealized Gains	6		3
Fair Value	$ 7		$ 4