Note 8 - Long-term Debt - Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Principal	$ 201,525	$ 173,150
Deferred Financing Costs, Net	(11,436)	(7,214)
Balance	190,089	165,936
Principal, Current	(2,000)	(1,750)
Deferred Financing Costs, Net, Current
Balance, Current	(2,000)	(1,750)
Principal, Non-current	199,525	171,400
Deferred Financing Costs, Net, Non-current	(11,436)	(7,214)
Balance, Non-current	188,089	164,186
Notes Payable, Other Payables [Member]
Principal	2,525	2,525
Deferred Financing Costs, Net
Balance	2,525	2,525
Line of Credit [Member]
Principal	199,000	170,625
Deferred Financing Costs, Net	(11,436)	(7,214)
Balance	$ 187,564	$ 163,411