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Supplemental balance sheet and cash flow information (available-for-sale debt securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale debt securities [Line Items] |  |  |  |
Cost | $ 25,702 |  | $ 28,495 |
Gross unrealized gains | 0 |  | 0 |
Gross unrealized losses | (311) |  | (33) |
Fair value | 25,391 |  | 28,462 |
Expected maturities of available-for-sale debt securities |  |  |  |
Due in one year or less | 14,550 |  |  |
Due in two to five years | 7,971 |  |  |
Due in six to ten years | 2,870 |  |  |
Fair value | 25,391 |  | 28,462 |
Funds held for customers [Member] |  |  |  |
Available-for-sale debt securities [Line Items] |  |  |  |
Cost | 25,702 | [1] | 28,495 | [2]
Gross unrealized gains | 0 | [1] | 0 | [2]
Gross unrealized losses | (311) | [1] | (33) | [2]
Fair value | 25,391 | [1] | 28,462 | [2]
Cash | 97,075 |  | 91,287 |
Expected maturities of available-for-sale debt securities |  |  |  |
Fair value | 25,391 | [1] | 28,462 | [2]
Funds held for customers [Member] | Money market securities [Member] | Domestic [Member] |  |  |  |
Available-for-sale debt securities [Line Items] |  |  |  |
Cost | 12,000 |  | 15,000 |
Gross unrealized gains | 0 |  | 0 |
Gross unrealized losses | 0 |  | 0 |
Fair value | 12,000 |  | 15,000 |
Expected maturities of available-for-sale debt securities |  |  |  |
Fair value | 12,000 |  | 15,000 |
Funds held for customers [Member] | Canadian and provincial government securities [Member] |  |  |  |
Available-for-sale debt securities [Line Items] |  |  |  |
Cost | 9,722 |  | 9,566 |
Gross unrealized gains | 0 |  | 0 |
Gross unrealized losses | (311) |  | (33) |
Fair value | 9,411 |  | 9,533 |
Expected maturities of available-for-sale debt securities |  |  |  |
Fair value | 9,411 |  | 9,533 |
Funds held for customers [Member] | Canadian guaranteed investment certificates [Member] |  |  |  |
Available-for-sale debt securities [Line Items] |  |  |  |
Cost | 3,980 |  | 3,929 |
Gross unrealized gains | 0 |  | 0 |
Gross unrealized losses | 0 |  | 0 |
Fair value | 3,980 |  | 3,929 |
Expected maturities of available-for-sale debt securities |  |  |  |
Fair value | $ 3,980 |  | $ 3,929 |
[1] | Funds held for customers, as reported on the consolidated balance sheet as of March 31, 2021, also included cash of $97,075.
[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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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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