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Note 7 - Selected Balance Sheet Data - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Pension and postretirement benefit obligations $ 188 $ 188
Deferred revenue 163 184
Current technology intangible liability 497 1,006
Current earn-out contingent consideration liability 219 1,090
Customer funded projects 775 759
TCPA litigation accrual (Note 11) 1,300 0
Other 1,088 1,008
Total $ 4,230 $ 4,235