Note 14 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Apr. 30, 2020
Long-Term Debt, Total	$ 2,252	$ 2,539
Paycheck Protection Program CARES Act [Member]
Long-Term Debt, Total			$ 1,800

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant