Note 12 - Income Taxes - Reconciliation of Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2019 Rate	Dec. 31, 2018 Rate	Dec. 31, 2017 Rate
Federal statutory rate	21.00%	21.00%	35.00%
Foreign rate differential	(2.90%)	(3.00%)	1.50%
Losses of foreign subsidiaries disregarded for US income tax		(1.30%)	(2.50%)
State income taxes, net of federal benefit	2.90%	(0.80%)	(3.00%)
Nondeductible loan costs		0.50%	1.40%
Nondeductible transaction costs	0.70%	1.10%
Impact of tax liquidation		10.40%
Tax indemnification charges	7.90%	9.50%	(1.30%)
Stock Compensation	1.00%	(1.40%)
Other differences	4.10%	2.70%	(2.70%)
Withholding tax	3.30%	1.70%	2.50%
Tax credits	(2.40%)	(12.00%)	(2.10%)
Uncertain tax positions	(26.00%)	(38.00%)	7.30%
Valuation allowance	0.30%	22.90%	47.20%
Rate change - impact of the Tax Act (Rate)			1990.00%
Repatriation tax - impact of the Tax Act (Rate)		(100.00%)	410.00%
Tax credits - impact of the Tax Act		0.60%	(6.00%)
Valuation allowance - impact of the Tax Act		0.40%	(35.30%)
Effective tax rate	(32.10%)	(28.70%)	(4.00%)