Note 5 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) - shares	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
Common stock, shares outstanding (in shares)	49,754,957	49,566,334	49,481,018
Total (in shares)	50,373,971		50,292,070
Restricted Stock Units and Stock Options [Member]
Common stock shares reserved (in shares)	546,749		661,893
New Creditor Warrants [Member]
Common stock shares reserved (in shares)	21,400		76,175
GulfMark Creditor Warrants [Member]
Common stock shares reserved (in shares)	50,865		72,984

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details