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Note 2 - Investments and Restricted Cash (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Available-for-sale Securities, Debt Securities, Current $ 36,500 $ 0 $ 29,100
Payments to Acquire Investments 11,113  
Proceeds from Sale and Maturity of Marketable Securities 3,634  
Available-for-sale Securities, Equity Securities, Noncurrent 5,100   5,000
Available-for-sale Equity Securities, Amortized Cost Basis $ 3,900   $ 4,100
Other than Temporary Impairment Losses, Investments   $ 1,000