Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Income Taxes [Line Items]
Income (loss) of foreign subsidiaries before taxes	$ 215,000	$ 57,000
Deferred tax valuation allowance against assets	1,080,000		$ 1,080,000
Income tax expense	2,000	$ 378,000	$ 73,000	$ 313,000
Corporate tax rate			21.00%	34.00%
Deduction for U.S. federal tax			100.00%
U.S. federal
Schedule Of Income Taxes [Line Items]
Net operating loss carry forwards, amount	$ 2,300,000		$ 2,300,000
Operating loss carryovers, limitations on use	At December 31, 2018, the Company had $2.3 million of U.S. federal net operating loss (“NOL”) carry forwards. These losses do not expire but are limited to utilization of 80% of taxable income in any one year.
Percentage of NOLs utilization limit against taxable income	80.00%
U.S. federal | Earliest Tax Year
Schedule Of Income Taxes [Line Items]
Open tax years			2014
U.S. federal | Latest Tax Year
Schedule Of Income Taxes [Line Items]
Open tax years			2017
States
Schedule Of Income Taxes [Line Items]
Net operating loss carry forwards, amount	$ 9,200,000		$ 9,200,000
States | Earliest Tax Year
Schedule Of Income Taxes [Line Items]
Open tax years			2013
States | Latest Tax Year
Schedule Of Income Taxes [Line Items]
Open tax years			2017