CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Mar. 31, 2018	Sep. 30, 2017
Current assets
Cash and cash equivalents	$ 23,438,543	$ 24,680,301
Accounts receivable	2,373,627	2,748,597
Unbilled receivables	926,629	1,480,822
Inventories	4,440,542	4,179,654
Prepaid expenses and other current assets	951,249	1,092,064
Total current assets	32,130,590	34,181,438
Property and equipment, net	6,588,808	6,669,011
Other assets	185,700	187,315
Total assets	38,905,098	41,037,764
Current liabilities
Accounts payable	1,390,535	1,321,251
Accrued expenses	1,554,859	1,760,037
Deferred revenue	220,245	280,354
Total current liabilities	3,165,639	3,361,642
Deferred income taxes	129,574	67,742
Total liabilities	3,295,213	3,429,384
Commitments and contingencies (See Note 6)
Shareholders' equity
Preferred stock, 10,000,000 shares authorized, $.001 par value, of which 200,000 shares are authorized as Class A Convertible stock. No shares issued and outstanding at March 31, 2018 and September 30, 2017
Common stock, $.001 par value: 75,000,000 shares authorized, 18,937,050 and 18,879,580 issued at March 31, 2018 and September 30, 2017, respectively	18,937	18,880
Additional paid-in capital	51,783,779	51,583,841
Retained earnings	5,175,706	7,374,196
Treasury stock, at cost, 2,096,451 shares at March 31, 2018 and September 30, 2017	(21,368,537)	(21,368,537)
Total shareholders' equity	35,609,885	37,608,380
Total liabilities and shareholders' equity	$ 38,905,098	$ 41,037,764

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).

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- 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.