Condensed Balance Sheets (Unaudited) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 27,611	$ 1,216,893
Restricted cash	550,000	150,000
Accounts receivable, net	5,946,867	4,070,576
Inventories	4,178,734	7,440,350
Prepaid expenses and other current assets	237,370	269,738
Total current assets	10,940,582	13,147,557
Other assets	345,000	349,335
Operating lease right-of-use assets, net	77,634	102,716
Equipment, net	281,051	303,099
Total assets	11,644,267	13,902,707
Current liabilities
Bank credit line	387,298	0
Accounts payable	2,776,811	5,024,529
Operating lease liabilities	77,634	102,716
Accrued other expenses	2,720,701	2,666,471
Total current liabilities	5,962,444	7,793,716
Total liabilities	5,962,444	7,793,716
Stockholders' equity
Common stock: authorized: 40,000,000 shares at $0.01 par value, Issued and outstanding: 21,276,762 shares at March 31, 2020 and 20,929,928 shares at December 31, 2019	212,767	209,299
Additional paid-in capital	46,817,573	46,496,330
Accumulated deficit	(41,348,517)	(40,596,638)
Total stockholders' equity	5,681,823	6,108,991
Total liabilities and stockholders' equity	$ 11,644,267	$ 13,902,707

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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

- Definition

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).