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Supplemental balance sheet and cash flow information (available-for-sale debt securities) (Details) - USD ($)
$ in Thousands

Sep. 30, 2021

Dec. 31, 2020

Available-for-sale debt securities [Line Items]

Cost

$ 13,617

$ 28,495

Gross unrealized gains

0

0

Gross unrealized losses

(315)

(33)

Fair value

13,302

28,462

Expected maturities of available-for-sale debt securities

Due in one year or less

7,041

Due in two to five years

3,453

Due in six to ten years

2,808

Fair value

13,302

28,462

Funds held for customers [Member]

Available-for-sale debt securities [Line Items]

Cost

13,617

^[1]

28,495

^[2]

Gross unrealized gains

0

^[1]

0

^[2]

Gross unrealized losses

(315)

^[1]

(33)

^[2]

Fair value

13,302

^[1]

28,462

^[2]

Cash

129,180

91,287

Expected maturities of available-for-sale debt securities

Fair value

13,302

^[1]

28,462

^[2]

Funds held for customers [Member] | Money market securities [Member] | Domestic [Member]

Available-for-sale debt securities [Line Items]

Cost

15,000

Gross unrealized gains

0

Gross unrealized losses

0

Fair value

15,000

Expected maturities of available-for-sale debt securities

Fair value

15,000

Funds held for customers [Member] | Canadian and provincial government securities [Member]

Available-for-sale debt securities [Line Items]

Cost

9,674

9,566

Gross unrealized gains

0

0

Gross unrealized losses

(315)

(33)

Fair value

9,359

9,533

Expected maturities of available-for-sale debt securities

Fair value

9,359

9,533

Funds held for customers [Member] | Canadian guaranteed investment certificates [Member]

Available-for-sale debt securities [Line Items]

Cost

3,943

3,929

Gross unrealized gains

0

0

Gross unrealized losses

0

0

Fair value

3,943

3,929

Expected maturities of available-for-sale debt securities

Fair value

$ 3,943

$ 3,929

[1]	Funds held for customers, as reported on the consolidated balance sheet as of September 30, 2021, also included cash of $129,180.
[2]	Funds held for customers, as reported on the consolidated balance sheet as of December 31, 2020, also included cash of $91,287.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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