Note 4 - Revenue Recognition 2 (Details Textual) - Vessel [Member] - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Location, Statement of Financial Position, Balance [Axis]: us-gaap:AccruedLiabilitiesCurrent | ||
| Contract with Customer, Liability, Current | $ 2.1 | $ 4.8 |
| Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsNoncurrent | ||
| Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent | 0.7 | 1.1 |
| Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent | ||
| Contract with Customer, Liability, Noncurrent | 1.3 | 3.6 |
| Location, Statement of Financial Position, Balance [Axis]: us-gaap:PrepaidExpenseAndOtherAssetsCurrent | ||
| Contract with Customer, Asset, after Allowance for Credit Loss, Current | $ 0.5 | $ 0.8 |
| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|