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Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
Mar. 31, 2019
Sep. 30, 2018
Current assets:    
Cash and cash equivalents $ 7,723,503 $ 11,063,091
Short-term marketable securities 3,108,878 3,592,175
Restricted cash 390,008 403,427
Accounts receivable, net 6,757,217 2,785,997
Inventories, net 8,305,843 6,734,183
Prepaid expenses and other 687,594 3,091,401
Total current assets 26,973,043 27,670,274
Long-term marketable securities 1,695,341 1,200,541
Long-term restricted cash 339,624 339,556
Deferred tax assets, net 5,399,853 5,957,000
Property and equipment, net 2,484,109 2,448,725
Goodwill 2,364,633 2,445,990
Intangible assets, net 1,355,709 1,557,346
Other assets 124,005 241,365
Total assets 40,736,317 41,860,797
Current liabilities:    
Accounts payable 1,227,925 3,083,344
Accrued liabilities 3,334,159 3,199,864
Notes payable, current portion 286,728 296,594
Total current liabilities 4,848,812 6,579,802
Notes payable, less current portion 33,744 52,358
Other liabilities, noncurrent 2,083,218 1,739,430
Total liabilities 6,965,774 8,371,590
Stockholders' equity:    
Preferred stock, $0.00001 par value; 5,000,000 shares authorized; none issued and outstanding
Common stock, $0.00001 par value; 50,000,000 shares authorized; 32,572,118 and 33,176,146 shares issued and outstanding, respectively 326 332
Additional paid-in capital 88,431,123 90,251,145
Accumulated deficit (54,292,105) (56,516,895)
Accumulated other comprehensive loss (368,801) (245,375)
Total stockholders' equity 33,770,543 33,489,207
Total liabilities and stockholders' equity $ 40,736,317 $ 41,860,797