Note 10 - Contract Assets and Liabilities 1 (Details Textual) - USD ($)	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Mar. 31, 2021
Contract with Customer, Receivable, after Allowance for Credit Loss, Total	$ 300,000		$ 300,000
Contract with Customer, Liability, Current	704,000		217,000
License [Member]
Contract with Customer, Liability, Noncurrent	1,567,000		$ 1,633,000	$ 2,000,000.0
Contract with Customer, Liability, Revenue Recognized	67,000	$ 67,000
Deposits held in Escrow for Properties Held for Sale [Member]
Contract with Customer, Liability, Current	$ 300,000