Note 7 - Derivative Instruments (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2020 PHP (₱)	Mar. 31, 2020 CAD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 PHP (₱)	Mar. 31, 2020 CAD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 PHP (₱)	Dec. 31, 2019 CAD ($)
Derivative, Notional Amount			$ 33,087			$ 15,408
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative Notional Amount, Acquired During Period	₱ 1,387,999,998	$ 3,028,575
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Minimum [Member]
Derivative, Term of Contract (Month)	3 months	3 months
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Maximum [Member]
Derivative, Term of Contract (Month)	12 months	12 months
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Canadian Foreign Exchange Contract [Member]
Derivative, Notional Amount			2,437		$ 3,300,000	1,047		$ 1,400,000
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Philippine Foreign Exchange Contract [Member]
Derivative, Notional Amount			$ 30,650	₱ 1,597,000,000		$ 14,361	₱ 769,000,000
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Maximum [Member]
Derivative, Term of Contract (Month)	3 years	3 years