Save very small numbers in database

I need to save numbers(basically cost) of per API call in mySQL database, For example I am getting a response from API as follows:

$object = stdClass Object
(
    [id] => 2457457845
    [price] => -0.00870      /// In USD
)

Now I want to save the call cost in mysql database.

My column type is decimal(5,5).

My Table Structure

+-----------------------+--------------+------+-----+---------+----------------+
| Field                 | Type         | Null | Key | Default | Extra          |
+-----------------------+--------------+------+-----+---------+----------------+
| id                    | int unsigned | NO   | PRI | NULL    | auto_increment |
| created_at            | timestamp    | YES  |     | NULL    |                |
| updated_at            | timestamp    | YES  |     | NULL    |                |               |
| call_start_date_utc   | timestamp    | NO   |     | NULL    |                |
| call_end_date_utc     | timestamp    | NO   |     | NULL    |                |                |
| call_duration         | int          | NO   |     | NULL    |                |
| call_price            | decimal(5,5) | NO   |     | NULL    |                |
| call_forwarded_from   | varchar(50)  | YES  |     | NULL    |                |
+-----------------------+--------------+------+-----+---------+----------------+

I try save it to database in the following manner:

$tcd = new CallData;
$tcd->created_at = Carbon::now();
$tcd->updated_at = Carbon::now();
$tcd->call_start_date_utc = date('Y-m-d H:i:s', strtotime($call_data->startTime->format('Y-m-d H:i:s')));
$tcd->call_end_date_utc = date('Y-m-d H:i:s', strtotime($call_data->endTime->format('Y-m-d H:i:s')));
$tcd->call_duration = $call_data->duration;
$tcd->call_price = ($call_data->price > 0) ? $call_data->price : abs($call_data->price);
$tcd->call_forwarded_from = $call_data->forwardedFrom;
$tcd->save();

I tried change the decimal type of column call_price to varchar(50) in database still it saves as 0. I am using abs() to convert negative to positive(just for display purpose).

I just want to save it as 0.00870 in the database. Can anyone guide me please?