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Note 8 - Accrued Liabilities (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
   

June 30,

   

December 31,

 
   

2021

   

2020

 
                 

Payroll expenses and taxes payable

  $ 486,000     $ 123,000  

Commissions and bonuses payable and general accrued liabilities

    754,000       2,670,000  

Total accrued liabilities

  $ 1,240,000     $ 2,793,000