Note 11 - Income Taxes (Restated) (Details Textual) - USD ($) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 20, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Mar. 31, 2017
Deferred Tax Liabilities, Undistributed Foreign Earnings		$ 110.5		$ 110.5
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		35.00%		35.00%
Accrued Estimated Foreign Tax Withholdings		$ 53.9		$ 53.9
Deferred Tax Assets, Tax Credit Carryforwards, Foreign		109.6		109.6
Deferred Tax Assets, Valuation Allowance, Total		74.6		$ 74.6			$ 116.2
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ (35.6)
Effective Income Tax Rate Reconciliation, Percent, Total		72.70%	25.10%	45.00%	23.30%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount		$ 0.8	$ 1.1	$ 1.7	$ 2.3
Undistributed Earnings of Foreign Subsidiaries						$ 367.0
Investment Tax Credit Carryforward [Member]
Deferred Tax Assets, Investments						$ 83.2
Tax Credit Carryforward Expiration Period						20 years
Minimum [Member] | General Business Tax Credit Carryforward [Member]
Tax Credit Carryforward Expiration Year						2026
Maximum [Member] | General Business Tax Credit Carryforward [Member]
Tax Credit Carryforward Expiration Year						2036
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total						$ 331.5
Domestic Tax Authority [Member] | Minimum [Member]
Tax Credit Carryforward Expiration Year						2029
Domestic Tax Authority [Member] | Maximum [Member]
Tax Credit Carryforward Expiration Year						2036
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total						$ 231.1
State and Local Jurisdiction [Member] | Minimum [Member]
Tax Credit Carryforward Expiration Year						2018
State and Local Jurisdiction [Member] | Maximum [Member]
Tax Credit Carryforward Expiration Year						2036
Foreign Tax Authority [Member] | Kenya Revenue Authority [Member]
Income Tax Examination, Penalties Paid	$ 2.6
Investment Deduction Percentage	150.00%
Income Tax Examination, Interest Expense	$ 1.2
Foreign Tax Authority [Member] | Minimum [Member]
Tax Credit Carryforward Expiration Year				2027
ISRAEL
National Corporate Tax Rate				16.00%
KENYA
National Corporate Tax Rate				37.50%
Specific Valuation Allowance Attributable to Current Year Projected Activity [Member]
Deferred Tax Assets, Valuation Allowance, Total		6.0		$ 6.0
U.S. Foreign Tax Credits [Member]
Deferred Tax Assets, Valuation Allowance, Total		$ 80.6		$ 80.6