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Note 4 - Acquisitions (Details Textual) - Cedar Holdings Group, Incorporated [Member]
$ in Thousands
3 Months Ended
Jan. 01, 2020
USD ($)
shares
Mar. 31, 2020
USD ($)
Business Combination, Consideration Transferred, Total $ 14,100  
Business Combination, Consideration Transferred, Estimated Price Adjustments 200  
Business Combination, Consideration Transferred, Net of Price Adjustments 13,901  
Payments to Acquire Businesses, Gross $ 9,000  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares 32,374  
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable $ 2,000  
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 4,000  
Business Combination, Contingent Consideration, Liability, Total $ 3,100  
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual   $ 1,200
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual   300
General and Administrative Expense [Member]    
Business Combination, Acquisition Related Costs   $ 100
Customer Relationships [Member]    
Finite-Lived Intangible Asset, Useful Life (Year) 7 years  
Network Rights [Member]    
Finite-Lived Intangible Asset, Useful Life (Year) 15 years  
Measurement Input, Discount Rate [Member]    
Business Combination, Contingent Consideration, Liability, Measurement Input 11.3