Note 1 - Significant Accounting Policies - Accruals For Sales and Marketing (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Balance	$ 174	$ 153
additions	580	864
usages	(717)	(805)
adjustments	146	(38)
Balance	$ 183	$ 174

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