| Note 8 - Credit Facility (Tables) | 12 Months Ended | |||||||||||||||
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| Dec. 31, 2024 | ||||||||||||||||
| Notes Tables | ||||||||||||||||
| Schedule of Maturities of Long-Term Debt [Table Text Block] | 
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| X | ||||||||||
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- Definition Tabular disclosure of maturity and sinking fund requirement for long-term debt. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- References No definition available. 
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