Note 12 - Fair Value Measurements - Fair Value of Financial Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Interest rate swap	$ 27	$ 148
Fair Value, Recurring [Member]
Total liabilities at fair value	27	148
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total liabilities at fair value	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total liabilities at fair value	27	148
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total liabilities at fair value	0	0
Fair Value, Recurring [Member] | Interest Rate Swap [Member]
Interest rate swap	27	148
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member]
Interest rate swap	0	0
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
Interest rate swap	27	148
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]
Interest rate swap	$ 0	$ 0