Note 5 - Long-term Debt - Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Principal	$ 200,525	$ 201,525
Deferred Financing Costs, Net	(12,865)	(11,436)
Balance	187,660	190,089
Principal, Current	(2,000)	(2,000)
Deferred Financing Costs, Net, Current
Balance, Current	(2,000)	(2,000)
Principal, Non-current	198,525	199,525
Deferred Financing Costs, Net, Non-current	(12,865)	(11,436)
Balance, Non-current	185,660	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	198,000	199,000
Deferred Financing Costs, Net	(12,865)	(11,436)
Balance	$ 185,135	$ 187,564