4. Cash and cash equivalents:

		2019	2018
	Cash and cash equivalents	$ 34,507	$ 35,740
	Cash and cash equivalents	$ 34,507	$ 35,740

The Corporation has an agreement with a Canadian chartered bank for an operating line of credit in the amount of $75,000 (2018 - $75,000) bearing interest at prime minus 0.25%. The line of credit restricts the availability of the Corporation to lien assets. As of December 31, 2019, the outstanding balance in the line of credit was $nil (2018 - $nil).

5. Accounts receivable:

		2019	2018
	Trade receivables	$ 25,039	$ 23,763
	Unbilled revenue	28,391	25,888
	Allowance for doubtful accounts	(1,286)	(985)
	Accounts receivable	$ 52,144	$ 48,666

6. Inventory:

Inventory consists of parts and supplies acquired for capital, internal construction, maintenance or recoverable work.

The amount of inventory consumed by the Corporation and recognized as an expense during 2019 was $5,645 (2018 - $5,625).