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Note 10 - Fair Value of Financial Instruments (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Financial Liabilities at Fair Value Option $ 35,100   $ 35,100   $ 34,000
Financial Assets at Fair Value Option 30,500   30,500   30,400
Financial Liabilities at Fair Value Option Accrued Interest Payable 200   $ 200   100
Fair Value Inputs, Discount Rate     85.00%    
Fair Value, Option, Changes in Fair Value, Gain (Loss) (1,159) $ (1,115) $ (1,537) $ (2,102)  
Financial Liabilites at Fair Value Option Contractual Principal 61,900   61,900   61,900
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]          
Assets, Fair Value Disclosure 0   0   0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0   0   0
Fair Value, Measurements, Nonrecurring [Member]          
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0   0   $ 0
Interest Rate Swap [Member]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ (700) $ (1,700) $ (500) $ (3,800)