Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Jun. 30, 2018	Sep. 30, 2017
Current assets:
Cash and cash equivalents	$ 12,030,076	$ 12,764,421
Short-term Securities	3,662,471	4,359,542
Restricted cash	346,027	39,466
Accounts receivable, net	6,583,346	5,681,882
Inventories, net	5,404,618	5,257,234
Prepaid expenses and other	862,812	983,322
Total current assets	28,889,350	29,085,867
Long-term marketable securities	1,269,688	711,124
Long-term restricted cash	98,455
Deferred tax assets, net	5,537,410	8,331,000
Property and equipment, net	497,483	509,603
Goodwill	2,455,611
Intangible assets, net	1,653,508	55,689
Other assets	241,429	164,517
Total assets	40,642,934	38,857,800
Current liabilities:
Accounts payable	1,754,593	1,112,366
Accrued liabilities	3,529,940	2,561,395
Notes payable, current portion	532,822
Total current liabilities	5,817,355	3,673,761
Notes payable, less current portion	207,530
Total liabilities	6,024,885	3,673,761
Stockholders' equity
Preferred stock, $0.00001 par value; 5,000,000 shares authorized; none issues and outstanding	0	0
Common stock, $0.00001 par value; 50,000,000 shares authorized; 32,651,763 and 32,158,436 shares issued and outstanding, respectively	325	322
Additional paid-in capital	88,917,349	87,956,839
Accumulated deficit	(54,074,417)	(52,771,853)
Accumulated other comprehensive loss	(225,208)	(1,269)
Total stockholders' equity	34,618,049	35,184,039
Total liabilities and stockholders' equity	$ 40,642,934	$ 38,857,800

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