Note 11 - Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Note 11 - Income Taxes (Details) [Line Items]
Effective Income Tax Rate Reconciliation, Percent			29.70%	26.40%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount	$ 880,000	$ 1,098,000	$ 2,026,000
Operating Loss Carryforwards, Valuation Allowance					$ 111,300,000
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
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
Domestic Tax Authority [Member]
Note 11 - Income Taxes (Details) [Line Items]
Operating Loss Carryforwards					$ 251,400,000
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
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