| Note 3 - Revenue From Contracts With Customers and Other Revenue (Tables) | 6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Jun. 30, 2023 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Disaggregation of Revenue [Table Text Block] | 
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| Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] | 
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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- References No definition available. 
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