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Note 7 - Income Taxes (Details Textual) - State and Local Jurisdiction [Member]
$ in Thousands
Dec. 31, 2020
USD ($)
Operating Loss Carryforwards, Total $ 302
Iowa Department of Revenue [Member]  
Operating Loss Carryforwards, Total 190
Tax Credit Carryforward, Amount 212
Minnesota Department of Revenue [Member]  
Tax Credit Carryforward, Amount 326
Wisconsin Department of Revenue [Member]  
Tax Credit Carryforward, Amount $ 586