Note 5 - Long-term Debt - Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Principal	$ 382,195	$ 230,001
Deferred Financing Costs, Net	(11,508)	(11,933)
Balance	370,687	218,068
Principal, Current	(11,816)	(4,525)
Deferred Financing Costs, Net, Current
Balance, Current	(11,816)	(4,525)
Principal, Non-current	370,379	225,476
Deferred Financing Costs, Net, Non-current	(11,508)	(11,933)
Balance, Non-current	358,871	213,543
Revolving Credit Facility [Member]
Principal	45,000
Deferred Financing Costs, Net	(455)
Balance	44,545
Notes Payable, Other Payables [Member]
Principal	2,525	2,525
Deferred Financing Costs, Net
Balance	2,525	2,525
Term Facility [Member]
Principal	196,499	197,000
Deferred Financing Costs, Net	(6,903)	(9,704)
Balance	189,596	187,296
First Senior Secured Credit Agreement [Member]
Principal	107,695
Deferred Financing Costs, Net	(1,933)
Balance	105,762
Second Senior Secured Credit Agreement [Member]
Principal	30,476	30,476
Deferred Financing Costs, Net	(2,217)	(2,229)
Balance	$ 28,259	$ 28,247