Management Contracts Purchased - Schedule of Contingent Payment Due under Asset Purchase Agreement (Parenthetical) (Detail) (FBR Funds [Member], USD $)	0 Months Ended
Sep. 30, 2013
FBR Funds [Member]
Contracts In Progress Costs And Earnings [Line Items]
Contingent purchase price for assets related to management of the FBR Funds	$ 19,193,595

Increase in management contracts initial purchase price of assets.

No definition available.

Name:	hnna_IncreaseInManagementContractsInitialPurchasePriceOfAssets
Namespace Prefix:	hnna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration