Note 5 - Long-term Debt - Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Principal	$ 201,025	$ 201,525
Deferred Financing Costs, Net	(11,020)	(11,436)
Balance	190,005	190,089
Principal, Current	(2,000)	(2,000)
Deferred Financing Costs, Net, Current
Balance, Current	(2,000)	(2,000)
Principal, Non-current	199,025	199,525
Deferred Financing Costs, Net, Non-current	(11,020)	(11,436)
Balance, Non-current	188,005	188,089
Notes Payable, Other Payables [Member]
Principal	2,525	2,525
Deferred Financing Costs, Net
Balance	2,525	2,525
Term Facility [Member]
Principal	198,500	199,000
Deferred Financing Costs, Net	(11,020)	(11,436)
Balance	$ 187,480	$ 187,564