Note 16 - Revision of Prior Period Financial Statements (Details Textual) - USD ($)	3 Months Ended									12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer, Excluding Assessed Tax, Total	$ 9,078,000	$ 10,646,000	$ 10,671,000	$ 9,972,000	$ 11,071,000	$ 10,420,000	$ 8,924,000	$ 16,729,000		$ 40,367,000	$ 47,144,000
Error Related to Recognition of Certain Revenues in Edge to Cloud Segment [Member] | Revision of Prior Period, Error Correction, Adjustment [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total									$ (77,000)