Note 6 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net loss	$ (14,005)	$ (83,256)	$ (37,695)	$ (41,813)
Basic (in shares)	8,403	8,362	8,403	8,368
Stock options, restricted shares and warrants (in shares)	0	0	0	0
Denominator for diluted earnings per share – adjusted weighted-average shares and assumed exercise of options and restricted shares (in shares)	8,403	8,362	8,403	8,368
Net loss per common share - basic (in dollars per share)	$ (1.67)	$ (9.96)	$ (4.49)	$ (5.00)
Net loss per common share - diluted (in dollars per share)	$ (1.67)	$ (9.96)	$ (4.49)	$ (5.00)