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Note 12 - Acquisition of AAT Carriers, Inc. (Details Textual) - USD ($) $ in Thousands		3 Months Ended
	Feb. 09, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Goodwill, Ending Balance		$ 58,217		$ 42,518
AAT Carriers Inc [Member]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Business Combination, Consideration Transferred, Total	$ 54,800
Stock Purchase Agreement, Earnout Component	20,000	20,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		20,000
Goodwill, Period Increase (Decrease), Total		(13,800)
Goodwill, Ending Balance	15,699	$ 15,700	$ 29,500
AAT Carriers Inc [Member] \| Minimum [Member]
Purchase Price, Including Earnout	35,000
AAT Carriers Inc [Member] \| Maximum [Member]
Purchase Price, Including Earnout	$ 57,000