Note 6 - Fair Values of Assets and Liabilities - Summary of Fair Value Hierarchy for Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Revolving credit facilities	$ 407,022	$ 389,707
Amortizing debt facilities	1,220	1,220
Notes payable to related parties	40,000	40,000
Convertible senior notes	62,313	62,142
Notes Payable Associated with Structured Financings, Fair Value	4,776	5,651
Fair Value, Inputs, Level 1 [Member]
Revolving credit facilities
Amortizing debt facilities
Notes payable to related parties
Convertible senior notes
Notes Payable Associated with Structured Financings, Fair Value
Fair Value, Inputs, Level 2 [Member]
Revolving credit facilities
Amortizing debt facilities
Notes payable to related parties
Convertible senior notes	47,230	47,230
Notes Payable Associated with Structured Financings, Fair Value
Fair Value, Inputs, Level 3 [Member]
Revolving credit facilities	407,022	389,707
Amortizing debt facilities	1,220	1,220
Notes payable to related parties	40,000	40,000
Convertible senior notes
Notes Payable Associated with Structured Financings, Fair Value	$ 4,776	$ 5,651

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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