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Condensed Consolidated Balance Sheets (Current Period Unaudited) (USD $)
Mar. 31, 2014
Sep. 30, 2013
Current assets:    
Cash $ 18,532,262 $ 15,805,195
Accounts receivable, less allowance of $11,809 and $3,772 for doubtful accounts 2,760,400 4,958,532
Inventories, net 5,494,742 4,587,750
Prepaid expenses and other 626,177 1,003,875
Total current assets 27,413,581 26,355,352
Property and equipment, net 356,840 237,377
Intangible assets, net 45,292 51,650
Prepaid expenses and other - noncurrent 820,766 914,516
Total assets 28,636,479 27,558,895
Current liabilities:    
Accounts payable 1,117,620 1,596,409
Accrued liabilities 1,654,991 1,054,968
Total current liabilities 2,772,611 2,651,377
Other liabilities - noncurrent 159,441 146,109
Total liabilities 2,932,052 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; 33,205,373 and 32,900,705 shares issued and outstanding, respectively 331 329
Additional paid-in capital 87,720,361 87,434,834
Accumulated deficit (62,016,265) (62,673,754)
Total stockholders' equity 25,704,427 24,761,409
Total liabilities and stockholders' equity $ 28,636,479 $ 27,558,895