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Note 4 - Financing Arrangements - Long-term Debt (Details) (Parentheticals) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Real Estate Term Note [Member]    
Variable rate basis 2.25% 2.25%
Interest rate 4.80% 4.80%
Monthly payments $ 41 $ 41
First Unsecured Subordinated Promissory Notes Payable [Member]    
Interest rate   4.00%
Second Unsecured Subordinated Promissory Notes Payable [Member]    
Interest rate   4.00%