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Note 3 - Investments and Fair Value Measurements - Reconciliation of Changes in Fair Value (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Inputs, Level 3 [Member] | Investment in Convertible Note Receivable [Member]    
Balance $ 0  
Fair value of Financial instrument liability at inception 858  
Fair value adjustment (33)  
Balance 825 $ 0
Convertible Notes Payable [Member] | Fair Value, Inputs, Level 3 [Member]    
Balance 1,955  
Loss on extinguishment on amendment to remove convertible feature 250  
Amortization of original issue discount 40  
Accrued interest 57  
Extinguishment of note (2,302)  
Balance 0 1,955
Contingent Consideration Liability [Member]    
Balance 720 0
Loss on extinguishment on amendment to remove convertible feature   0
Balance $ 720 720
Contingent consideration valued at acquisition of Reach Construction Group, LLC   $ 720