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Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Statement of Financial Position [Abstract]    
Property and equipment, accumulated depreciation $ 597us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 554us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Other assets, accumulated amortization $ 264hnna_OtherAssetsAccumulatedAmortization $ 242hnna_OtherAssetsAccumulatedAmortization
Adjustable rate preferred stock, stated value $ 25us-gaap_PreferredStockParOrStatedValuePerShare $ 25us-gaap_PreferredStockParOrStatedValuePerShare
Adjustable rate preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Adjustable rate preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Adjustable rate preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, no par value      
Common stock, shares authorized 15,000,000us-gaap_CommonStockSharesAuthorized 15,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 6,024,621us-gaap_CommonStockSharesIssued 6,019,276us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 6,024,621us-gaap_CommonStockSharesOutstanding 6,019,276us-gaap_CommonStockSharesOutstanding