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Note 6 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) - shares	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Common stock, shares outstanding (in shares)	50,895,235	50,554,179	42,029,882
Total (in shares)	52,596,884		52,461,717
Restricted Stock Units and Stock Options [Member]
Common stock shares reserved (in shares)	1,520,226		1,627,083
New Creditor Warrants [Member]
Common stock shares reserved (in shares)	81,244		395,401
GulfMark Creditor Warrants [Member]
Common stock shares reserved (in shares)	100,179		309,351
SPO Acquisition Warrants [Member]
Common stock shares reserved (in shares)	0		8,100,000

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