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Note 10 - Significant Risk Concentrations (Details Textual) - USD ($)	3 Months Ended			6 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer, Excluding Assessed Tax, Total	$ 10,671,000	$ 8,924,000	$ 14,718,000	$ 20,643,000	$ 25,653,000	$ 43,994,000		$ 59,360,000
Accounts Receivable, after Allowance for Credit Loss, Current, Total	6,318,000			6,318,000			$ 6,177,000
GES Singapore Pte, LTD [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total	1,000,000.0
Accounts Receivable, after Allowance for Credit Loss, Current, Total	$ 801,000			$ 801,000
GES Singapore Pte, LTD [Member] \| Customer Concentration Risk [Member] \| Revenue from Contract with Customer Benchmark [Member]
Concentration Risk, Percentage	10.00%
GES Singapore Pte, LTD [Member] \| Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration Risk, Percentage				13.00%
ParTech, Inc. [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total	$ 1,100,000
ParTech, Inc. [Member] \| Customer Concentration Risk [Member] \| Revenue from Contract with Customer Benchmark [Member]
Concentration Risk, Percentage	11.00%
CCIntegration, Inc [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total	$ 1,200,000
CCIntegration, Inc [Member] \| Customer Concentration Risk [Member] \| Revenue from Contract with Customer Benchmark [Member]
Concentration Risk, Percentage	14.00%
Honeywell International, Inc [Member]
Accounts Receivable, after Allowance for Credit Loss, Current, Total							$ 680,000
Honeywell International, Inc [Member] \| Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration Risk, Percentage							12.00%
Kodak Alaris, Inc [Member]
Accounts Receivable, after Allowance for Credit Loss, Current, Total							$ 866,000
Kodak Alaris, Inc [Member] \| Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration Risk, Percentage							15.00%