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Condensed Consolidated Balance Sheets (Current Period Unaudited) (USD $)
Jun. 30, 2014
Sep. 30, 2013
Current assets:    
Cash $ 21,200,411 $ 15,805,195
Accounts receivable, less allowance of $9,488 and $3,772 for doubtful accounts 3,748,503 4,958,532
Inventories, net 4,731,999 4,587,750
Prepaid expenses and other 549,690 1,003,875
Total current assets 30,230,603 26,355,352
Property and equipment, net 336,649 237,377
Intangible assets, net 46,695 51,650
Prepaid expenses and other - noncurrent 773,891 914,516
Total assets 31,387,838 27,558,895
Current liabilities:    
Accounts payable 652,280 1,596,409
Accrued liabilities 3,007,470 1,054,968
Total current liabilities 3,659,750 2,651,377
Other liabilities - noncurrent 160,847 146,109
Total liabilities 3,820,597 2,797,486
Commitments and contingencies (Note 8)      
Preferred stock, $0.00001 par value; 5,000,000 shares authorized; none issued and outstanding 0 0
Common stock, $0.00001 par value; 50,000,000 shares authorized; 33,002,099 and 32,900,705 shares issued and outstanding, respectively 330 329
Additional paid-in capital 87,640,361 87,434,834
Accumulated deficit (60,073,450) (62,673,754)
Total stockholders' equity 27,567,241 24,761,409
Total liabilities and stockholders' equity $ 31,387,838 $ 27,558,895