You may want to do more in depth research based on this statement :
"In terms of cash you'll note that despite despite a NPAT the cash balance has diminished, this appears to be a largely due to account management with the receivables having grown to 1/3 of revenue. Is this indicative of an increased carry of questionable accounts that will also be written off? On this trajectory I wouldn't be surprised to see them going to market for funds before the year is out and feel it was somewhat irresponsible to pay a dividend."
You will see the answer here in the appendices of the Annual report if you do not understand prepayments, or assume the Govt will go broke then probably best to not invest here also past due accounts seem to be improving with little past 90 days :
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