SUPPLEMENTAL BALANCE SHEET AND CASH FLOW INFORMATION (available-for-sale debt securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019		Dec. 31, 2018
Available-for-sale debt securities [Line Items]
Cost	$ 34,754	[1]	$ 31,818	[2]
Gross unrealized gains	0	[1]	0	[2]
Gross unrealized losses	(304)	[1]	(355)	[2]
Available-for-sale debt securities	34,450	[1]	31,463	[2]
Expected maturities of available-for-sale debt securities
Due in one year or less	28,700
Due in two to five years	3,282
Due in six to ten years	2,468
Available-for-sale debt securities	34,450	[1]	31,463	[2]
Funds held for customers [Member]
Available-for-sale debt securities [Line Items]
Cash	83,191		69,519
Funds held for customers [Member] | Money market securities [Member] | Domestic [Member]
Available-for-sale debt securities [Line Items]
Cost	18,000		16,000
Gross unrealized gains	0		0
Gross unrealized losses	0		0
Available-for-sale debt securities	18,000		16,000
Expected maturities of available-for-sale debt securities
Available-for-sale debt securities	18,000		16,000
Funds held for customers [Member] | Canadian and provincial government securities [Member]
Available-for-sale debt securities [Line Items]
Cost	9,056		8,485
Gross unrealized gains	0		0
Gross unrealized losses	(304)		(355)
Available-for-sale debt securities	8,752		8,130
Expected maturities of available-for-sale debt securities
Available-for-sale debt securities	8,752		8,130
Funds held for customers [Member] | Guaranteed investment certificates [Member]
Available-for-sale debt securities [Line Items]
Cost	7,698		7,333
Gross unrealized gains	0		0
Gross unrealized losses	0		0
Available-for-sale debt securities	7,698		7,333
Expected maturities of available-for-sale debt securities
Available-for-sale debt securities	$ 7,698		$ 7,333

[1] ) Funds held for customers, as reported on the consolidated balance sheet as of December 31, 2019, also included cash of $83,191.

[2] Funds held for customers, as reported on the consolidated balance sheet as of December 31, 2018, also included cash of $69,519.