Note 7 - Income Taxes (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Expense (Benefit), Total		$ 902	$ 400
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount		1,486	340
Goodwill, Impairment Loss	$ 800	800	4,845
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount		120	727
Deferred Income Tax Benefit, Goodwill Impairment			300
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				21.00%	35.00%
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Total		4,300	500
Operating Loss Carryforwards, Subject to Expiration		500	$ 500
Foreign Tax Authority [Member]
Tax Credit Carryforward, Amount		$ 500