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Note 10 - Contract Assets and Liabilities 1 (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2020
Contract with Customer, Receivable, after Allowance for Credit Loss, Total $ 400,000 $ 300,000  
Contract with Customer, Liability, Current 2,796,000 217,000  
License [Member]      
Contract with Customer, Liability, Noncurrent 1,600,000 $ 1,633,000 $ 2,000,000.0
Contract with Customer, Liability, Revenue Recognized 33,000    
Deposits held in Escrow for Properties Held for Sale [Member]      
Contract with Customer, Liability, Current $ 2,300,000