3.	ACCOUNTS RECEIVABLE, NET, CONTRACT ASSET AND CONTRACT LIABILITY:

Accounts Receivables, net, contract asset and contract liability were as follows (in thousands):

	2021		2020
Accounts Receivable, net	$	1,961	$	2,784
Contract Asset		421		195
Contract Liability		5,798		2,189

Accounts Receivables, net consist of

$1,961

and

$2,784

from customers as of

April 30, 2021

and

April 30, 2020,

respectively. At

April 30, 2021

, and

2020

, the allowance for doubtful accounts was

$143

and

$143,

respectively.

Contract assets are net of progress payments and performance based payments from our customers as well as advance payments from customers totaling

$421

and

$195

as of

April

30,

2021

and

2020.

Contract assets increased

$226

during

2021,

primarily due to the recognition of revenue related to the satisfaction or partial satisfaction of performance obligations during

2021

for which we have

not

yet billed our customers. There were

significant impairment losses related to our contract assets during

2021

and

2020.

We expect to bill our customers for the majority of the

April 30, 2021

contract assets during fiscal year end

2022.

Contract liabilities increased

$3.6

million during

2021,

primarily due to payments received in excess of revenue recognized on these performance obligations. During

2021,

we recognized

$2.1

million of our contract liabilities at

April

30,

2020

as revenue. During

2020,

we recognized

$2.7

million of our contract liabilities at

April

30,

2019

as revenue.