Note 5 - Long-term Debt - Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Principal	$ 412,340	$ 230,001
Deferred Financing Costs, Net	(11,057)	(11,933)
Balance	401,283	218,068
Principal, Current	(5,646)	(4,525)
Deferred Financing Costs, Net, Current	0	0
Balance, Current	(5,646)	(4,525)
Principal, Non-current	406,694	225,476
Deferred Financing Costs, Net, Non-current	(11,057)	(11,933)
Balance, Non-current	395,637	213,543
Revolving Credit Facility [Member]
Principal	45,000	0
Deferred Financing Costs, Net	(417)	0
Balance	44,583	0
Notes Payable, Other Payables [Member]
Principal	2,525	2,525
Deferred Financing Costs, Net	0	0
Balance	2,525	2,525
Term Facility [Member]
Principal	196,000	197,000
Deferred Financing Costs, Net	(6,558)	(9,704)
Balance	189,442	187,296
First Senior Secured Credit Agreement [Member]
Principal	107,695	0
Deferred Financing Costs, Net	(1,883)	0
Balance	105,812	0
Second Senior Secured Credit Agreement [Member]
Principal	61,120	30,476
Deferred Financing Costs, Net	(2,199)	(2,229)
Balance	$ 58,921	$ 28,247