Note 14 - Debt - Information Pertaining to Convertible Notes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Original issue discount paid with 2020/21 Notes	$ 0	$ 282	$ 0
Embedded Derivative, Convertible 2020 Notes [Member]
Balance	0	0
Amortization of debt discount		0
Amortization of debt issue costs		0
Paid-in-kind interest		0
Conversion of 2020/21 Notes into common Stock		0
Fair value of 2020/21 embedded derivative liability upon issuance		2,848
Increase in fair value of 2020/21 Notes embedded derivative liability prior to conversion of 2020/21 Notes		5,759
Decrease in fair value of 2020/21 Notes embedded derivative liability upon conversion to common stock		(8,607)
Embedded Derivative, Convertible 2020 and 2020/21 Notes [Member]
Balance	0	13,900
Amortization of debt discount		405
Amortization of debt issue costs		30
Paid-in-kind interest		316
Conversion of 2020/21 Notes into common Stock		(14,651)
Fair value of 2020/21 embedded derivative liability upon issuance		2,848
Increase in fair value of 2020/21 Notes embedded derivative liability prior to conversion of 2020/21 Notes		5,759
Decrease in fair value of 2020/21 Notes embedded derivative liability upon conversion to common stock		(8,607)
Convertible Debt [Member]
Balance	0	(123)
Balance	0	(30)
Balance	0	13,900
Amortization of debt discount		405
Amortization of debt issue costs		30
Paid-in-kind interest		316
Conversion of 2020/21 Notes into common Stock		0
Conversion of 2020/21 Notes into common Stock		0
Conversion of 2020/21 Notes into common Stock		(14,651)
Original issue discount paid with 2020/21 Notes		(282)
Convertible 2020 Notes [Member] | Convertible Debt [Member]
Balance	0	14,053
Paid-in-kind interest		47
Exchange of 2020 Notes for 2020/21 Notes		(14,100)
Conversion of 2020/21 Notes into common Stock		0
Original issue discount paid with 2020/21 Notes		0
Convertible 2020/21 Notes [Member] | Convertible Debt [Member]
Balance	$ 0	0
Paid-in-kind interest		269
Exchange of 2020 Notes for 2020/21 Notes		14,100
Conversion of 2020/21 Notes into common Stock		(14,651)
Original issue discount paid with 2020/21 Notes		$ 282