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Condensed Consolidated Balance Sheets (Current Period Unaudited) (USD $)
Mar. 31, 2015
Sep. 30, 2014
Current assets:    
Cash and cash equivalents $ 19,147,928us-gaap_CashAndCashEquivalentsAtCarryingValue $ 23,894,744us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term Securities 1,746,087us-gaap_MarketableSecuritiesCurrent  
Accounts receivable, net 2,347,131us-gaap_AccountsReceivableNetCurrent 4,284,051us-gaap_AccountsReceivableNetCurrent
Inventories, net 4,561,878us-gaap_InventoryNet 3,895,736us-gaap_InventoryNet
Prepaid expenses and other 693,491us-gaap_PrepaidExpenseAndOtherAssetsCurrent 523,947us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 28,496,515us-gaap_AssetsCurrent 32,598,478us-gaap_AssetsCurrent
Long-term Securities 2,799,988us-gaap_MarketableSecuritiesNoncurrent  
Property and equipment, net 413,907us-gaap_PropertyPlantAndEquipmentNet 360,084us-gaap_PropertyPlantAndEquipmentNet
Intangible assets, net 52,024us-gaap_IntangibleAssetsNetExcludingGoodwill 53,835us-gaap_IntangibleAssetsNetExcludingGoodwill
Prepaid expenses and other, noncurrent 672,680us-gaap_PrepaidExpenseAndOtherAssetsNoncurrent 766,423us-gaap_PrepaidExpenseAndOtherAssetsNoncurrent
Total assets 32,435,114us-gaap_Assets 33,778,820us-gaap_Assets
Current liabilities:    
Accounts payable 1,036,652us-gaap_AccountsPayableCurrent 830,503us-gaap_AccountsPayableCurrent
Accrued liabilities 1,494,912us-gaap_AccruedLiabilitiesCurrent 4,087,976us-gaap_AccruedLiabilitiesCurrent
Total current liabilities 2,531,564us-gaap_LiabilitiesCurrent 4,918,479us-gaap_LiabilitiesCurrent
Other liabilities, noncurrent 146,188us-gaap_OtherLiabilitiesNoncurrent 157,550us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 2,677,752us-gaap_Liabilities 5,076,029us-gaap_Liabilities
Commitments and contingencies (Note 9)     
Stockholders' equity:    
Preferred stock, $0.00001 par value; 5,000,000 shares authorized; none issued and outstanding 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $0.00001 par value; 50,000,000 shares authorized; 33,250,943 and 33,236,489 shares issued and outstanding 333us-gaap_CommonStockValue 332us-gaap_CommonStockValue
Treasury stock, at cost, 24,506 shares (57,106)us-gaap_TreasuryStockValue  
Additional paid-in capital 88,363,558us-gaap_AdditionalPaidInCapital 88,049,125us-gaap_AdditionalPaidInCapital
Accumulated deficit (58,550,521)us-gaap_RetainedEarningsAccumulatedDeficit (59,346,666)us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income 1,098us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Total stockholders' equity 29,757,362us-gaap_StockholdersEquity 28,702,791us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 32,435,114us-gaap_LiabilitiesAndStockholdersEquity $ 33,778,820us-gaap_LiabilitiesAndStockholdersEquity