Note 8 - Derivative Instruments (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2019 PHP (₱)	Dec. 31, 2019 CAD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 PHP (₱)	Dec. 31, 2019 CAD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 PHP (₱)	Dec. 31, 2018 CAD ($)
Derivative, Notional Amount			$ 15,408			$ 22,947
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative Notional Amount, Acquired During Period	₱ 1,702,000,008	$ 2,299,993
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Minimum [Member]
Derivative, Term of Contract	3 months	3 months
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Maximum [Member]
Derivative, Term of Contract	12 months	12 months
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Canadian Foreign Exchange Contract [Member]
Derivative, Notional Amount			1,047		$ 1,400	1,951		$ 2,500
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Philippine Foreign Exchange Contract [Member]
Derivative, Notional Amount			$ 14,361	₱ 769,000		$ 20,996	₱ 1,134,000
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Maximum [Member]
Derivative, Term of Contract	3 years	3 years