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Note 5 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) - shares	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Common stock, shares outstanding (in shares)	52,322,461	52,259,303	52,839,862
Total (in shares)	53,171,525		54,522,460
Restricted Stock Units and Stock Options [Member]
Common stock shares reserved (in shares)	695,576		1,505,519
New Creditor Warrants [Member]
Common stock shares reserved (in shares)	76,175		81,244
GulfMark Creditor Warrants [Member]
Common stock shares reserved (in shares)	77,313		95,835

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