Note 11 - Income Taxes - Effective Tax Rate Analysis and Reconciliation of Expected Statutory Rate (Details) - USD ($) $ in Thousands	3 Months Ended														12 Months Ended
	Dec. 31, 2020	[1]	Sep. 30, 2020	[2]	Jun. 30, 2020	[3]	Mar. 31, 2020	[4]	Dec. 31, 2019	Sep. 30, 2019	[5]	Jun. 30, 2019	[6]	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Expected income tax expense (benefit) at U.S. statutory rate															$ (259)	$ 547
Dividend from foreign subsidiaries															83	97
NOL carryforwards utilized															64	32
Restricted stock compensation															62	114
Global intangible low taxed income															35	30
Nondeductible expenses															8	4
Current year tax credits (foreign and research)															(82)	(234)
Domestic tax benefit, net of Federal benefit															(68)	(184)
Changes in valuation allowance															(65)	(7)
Foreign income tax rate differences															(34)	(51)
Section 250 foreign derived intangible income deduction															(9)	(145)
Other															(71)	79
Income tax expense (benefit)	$ (74)		$ (25)		$ 13		$ (250)		$ (76)	$ 147		$ (113)		$ 324	$ (336)	$ 282

[1] The quarter ended December 31, 2020 includes $1,078 of restructuring and other charges which are discussed in Note 3.

[2] The quarter ended September 30, 2020 includes $161 of restructuring and other charges which are discussed in Note 3.

[3] The quarter ended June 30, 2020 includes $38 of restructuring and other charges which are discussed in Note 3.

[4] The quarter ended March 31, 2020 includes $8 of restructuring and other charges which are discussed in Note 3.

[5] The quarter ended September 30, 2019 includes $17 of restructuring and other charges which are discussed in Note 3.

[6] The quarter ended June 30, 2019 includes $223 of restructuring and other charges which are discussed in Note 3.