Note 6 - Long-term Debt - Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Principal	$ 230,001	$ 201,525
Deferred Financing Costs, Net	(11,933)	(11,436)
Balance	218,068	190,089
Principal, Current	(4,525)	(2,000)
Deferred Financing Costs, Net, Current
Balance, Current	(4,525)	(2,000)
Principal, Non-current	225,476	199,525
Deferred Financing Costs, Net, Non-current	(11,933)	(11,436)
Balance, Non-current	213,543	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	197,000	199,000
Deferred Financing Costs, Net	(9,704)	(11,436)
Balance	187,296	187,564
Senior Secured Credit Agreement [Member]
Principal	30,476
Deferred Financing Costs, Net	(2,229)
Balance	$ 28,247