Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Dec. 31, 2018	Sep. 30, 2018
Current assets:
Cash and cash equivalents	$ 4,416,106	$ 11,063,091
Short-term marketable securities	3,783,863	3,592,175
Restricted cash	397,933	403,427
Accounts receivable, net	8,698,868	2,785,997
Inventories, net	8,708,732	6,734,183
Prepaid expenses and other	953,891	3,091,401
Total current assets	26,959,393	27,670,274
Long-term marketable securities	899,759	1,200,541
Long-term restricted cash	339,591	339,556
Deferred tax assets, net	5,673,997	5,957,000
Property and equipment, net	2,362,920	2,448,725
Goodwill	2,412,680	2,445,990
Intangible assets, net	1,459,572	1,557,346
Other assets	241,310	241,365
Total assets	40,349,222	41,860,797
Current liabilities:
Accounts payable	3,013,104	3,083,344
Accrued liabilities	2,079,618	3,199,864
Notes payable, current portion	292,554	296,594
Total current liabilities	5,385,276	6,579,802
Notes payable, less current portion	51,644	52,358
Other liabilities, noncurrent	1,916,139	1,739,430
Total liabilities	7,353,059	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; 32,589,321 and 33,176,146 shares issued and outstanding, respectively	326	332
Additional paid-in capital	88,766,502	90,251,145
Accumulated deficit	(55,470,955)	(56,516,895)
Accumulated other comprehensive loss	(299,710)	(245,375)
Total stockholders' equity	32,996,163	33,489,207
Total liabilities and stockholders' equity	$ 40,349,222	$ 41,860,797

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682