Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Incremental Costs of Obtaining a Contract, Deferred During Period	$ 108,000	$ 605,000	$ 342,000	$ 1,500,000
Capitalized Contract Cost, Net, Noncurrent	3,167,000		3,167,000		$ 3,772,000
Capitalized Contract Cost, Impairment Loss	$ 400	$ 15,000	1,000	22,000
Operating Lease, Impairment Loss				$ 324,000	324,000
Asset Impairment Charges, Total			$ 0		$ 0
Minimum [Member]
Capitalized Contract Cost, Amortization Period (Year)	3 years		3 years
Maximum [Member]
Capitalized Contract Cost, Amortization Period (Year)	5 years		5 years