Note 11 - Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Note 11 - Income Taxes (Details) [Line Items]
Extended Period for Deduction of Tax Losses Term			10 years
Effective Income Tax Rate Reconciliation, Percent			29.30%	26.50%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount	$ 602,000	$ 895,000	$ 2,628,000	$ 2,921,000
Deferred Tax Assets, Investments					$ 700,000
Deferred Tax Assets, Tax Credit Carryforwards, General Business					71,400,000
Deferred Tax Assets, Valuation Allowance					111,300,000	$ 114,800,000
Undistributed Earnings of Foreign Subsidiaries					$ 75,900,000
KENYA
Note 11 - Income Taxes (Details) [Line Items]
Deferred Foreign Income Tax Expense (Benefit)	$ 49,400,000		$ 49,400,000
Investment Deduction Percentage			50.00%
Investment Tax Credit Carryforward [Member]
Note 11 - Income Taxes (Details) [Line Items]
Tax Credit Carryforward Expiration Period					20 years
General Business Tax Credit Carryforward [Member]
Note 11 - Income Taxes (Details) [Line Items]
Tax Credit Carryforward Expiration Period					20 years
Foreign Tax Authority [Member] | KENYA
Note 11 - Income Taxes (Details) [Line Items]
Investment Deduction Percentage			150.00%
Domestic Tax Authority [Member]
Note 11 - Income Taxes (Details) [Line Items]
Operating Loss Carryforwards					$ 280,200,000
State and Local Jurisdiction [Member]
Note 11 - Income Taxes (Details) [Line Items]
Operating Loss Carryforwards					$ 216,500,000
Minimum [Member] | Investment Tax Credit Carryforward [Member]
Note 11 - Income Taxes (Details) [Line Items]
Tax Credit Carryforward Expiration Year					2022
Minimum [Member] | General Business Tax Credit Carryforward [Member]
Note 11 - Income Taxes (Details) [Line Items]
Tax Credit Carryforward Expiration Year					2026
Minimum [Member] | Foreign Tax Authority [Member] | KENYA
Note 11 - Income Taxes (Details) [Line Items]
Extended Period for Deduction of Tax Losses Term			5 years
Maximum [Member] | Investment Tax Credit Carryforward [Member]
Note 11 - Income Taxes (Details) [Line Items]
Tax Credit Carryforward Expiration Year					2024
Maximum [Member] | General Business Tax Credit Carryforward [Member]
Note 11 - Income Taxes (Details) [Line Items]
Tax Credit Carryforward Expiration Year					2034
Maximum [Member] | Foreign Tax Authority [Member] | KENYA
Note 11 - Income Taxes (Details) [Line Items]
Extended Period for Deduction of Tax Losses Term			10 years