Note 1 - Significant Accounting Policies - Accruals For Sales and Marketing (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Balance	$ 102	$ 76
additions	435	319
usages	(364)	(248)
adjustments	(20)	(45)
Balance	$ 153	$ 102

Amount of adjustments to sales and marketing reserve allowance during the period.

No definition available.

Name:	msn_SalesAndMarketingReserveAllowanceAdjustments
Namespace Prefix:	msn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration