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Note 3 - Acquisition (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 14, 2020
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Payments to Acquire Businesses, Gross       $ (0) $ 210
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue $ 15        
Other Nonoperating Income (Expense), Total       $ 15 $ (3)
NSENA Inc. [Member]          
Payments to Acquire Businesses, Gross 210        
Business Combination, Consideration Transferred, Liabilities Incurred   $ 0 $ 23    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue 15        
Other Nonoperating Income (Expense), Total   $ 23      
Acquired Finite-lived Intangible Asset, Residual Value 0        
NSENA Inc. [Member] | Short-term Note Payable [Member]          
Business Combination, Consideration Transferred, Liabilities Incurred 275        
NSENA Inc. [Member] | Note Payale on March 15, 2021 [Member]          
Business Combination, Consideration Transferred, Liabilities Incurred 100        
NSENA Inc. [Member] | Note Payble on June 15, 2021 [Member]          
Business Combination, Consideration Transferred, Liabilities Incurred 100        
NSENA Inc. [Member] | Note Payable on September 15, 2021 [Member]          
Business Combination, Consideration Transferred, Liabilities Incurred $ 75