Note 1 - Summary of Significant Accounting Policies - Schedule of Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Gross carrying amount	$ 2,342	$ 2,293
Accumulated amortization	1,212	1,120
Net book value	$ 1,130	$ 1,173	[1]
Customer Relationships [Member]
Remaining lives (Year)	9 years	9 years
Gross carrying amount	$ 1,302	$ 1,302
Accumulated amortization	868	795
Net book value	$ 434	$ 507
Intellectual Property [Member]
Remaining lives (Year)	3 years	3 years
Gross carrying amount	$ 100	$ 100
Accumulated amortization	100	100
Net book value	$ 0	$ 0
Trade Names [Member]
Remaining lives (Year)	20 years	20 years
Gross carrying amount	$ 814	$ 814
Accumulated amortization	244	225
Net book value	$ 570	$ 589
Patents [Member]
Remaining lives (Year)	7 years	7 years
Gross carrying amount	$ 126	$ 77
Accumulated amortization	0	0
Net book value	$ 126	$ 77

[1] The balance sheet at December 31, 2020 has been derived from the audited financial statements at that date