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Note 12 - Fair Value Measurements - Fair Value of Financial Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Interest rate swap $ 148 $ 78
Fair Value, Recurring [Member]    
Total liabilities at fair value 148 78
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Total liabilities at fair value
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Total liabilities at fair value 148 78
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Total liabilities at fair value
Fair Value, Recurring [Member] | Interest Rate Swap [Member]    
Interest rate swap 148 78
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member]    
Interest rate swap
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]    
Interest rate swap 148 78
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]    
Interest rate swap