Note 1 - Significant Accounting Policies - Accruals For Sales and Marketing (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Balance	$ 153	$ 102
additions	864	435
usages	(805)	(364)
adjustments	(38)	(20)
Balance	$ 174	$ 153

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