Note 1 - Summary of Significant Accounting Policies (Tables)  | 
12 Months Ended | ||||||||||||||||||||
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Dec. 31, 2021  | |||||||||||||||||||||
| Notes Tables | |||||||||||||||||||||
| Property, Plant and Equipment Useful Life [Table Text Block] | 
    
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| X | ||||||||||
- Definition Tabular disclosure of property, plant and equipment. No definition available. 
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| X | ||||||||||
- References No definition available. 
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