Note 9 - Fair Value Measurements - Fair Value of Financial Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Interest rate swap	$ 177	$ 78
Fair Value, Recurring [Member]
Total liabilities at fair value	177	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	177	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	177	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	177	78
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]
Interest rate swap