Note 3 - Concentration of Credit Risk	6 Months Ended
Jun. 30, 2023
Notes to Financial Statements
Concentration Risk Disclosure [Text Block]	NOTE 3: CONCENTRATION OF CREDIT RISK Cash and cash equivalents The Company had cash and cash equivalents of $13.0 million and $14.4 million at June 30, 2023 and December 31, 2022, respectively. The Company invests excess cash in U.S. treasury bills, certificates of deposit or deposit accounts, all with maturities of less than three months. Cash equivalents consisting of U.S. treasury bills were $10.0 million and $11.7 million at June 30, 2023 and December 31, 2022, respectively. The Company places most of its temporary cash investments in the United States with financial institutions, which from time to time may exceed the Federal Deposit Insurance Corporation limit. The amount at risk at June 30, 2023 and December 31, 2022 was $2.6 million and $1.5 million, respectively. The Company’s cash balance at its Tantaline subsidiary based in Denmark exceeded the government guarantee limit by approximately $0.5 million at December 31, 2022. Account receivable The Company sells products and services to various companies across several industries in the ordinary course of business. The Company performs ongoing credit evaluations to assess the probability of accounts receivable collection based on a number of factors, including past transaction experience, evaluation of their credit history and review of the invoicing terms of the contract to determine the financial strength of its customers. Accounts receivable are presented net of an allowance for doubtful accounts of approximately $36,000 at both June 30, 2023 and December 31, 2022. The allowance is based on prior experience and management’s evaluation of the collectability of accounts receivable. Measurement of credit losses requires consideration of historical loss experience, including the need to adjust for changing business conditions, and judgments about the probable effects of relevant observable data, including present economic conditions such as delinquency rates and the financial health of specific customers. Future changes to the estimated allowance for doubtful accounts could be material to our results of operations and financial condition. At June 30, 2023, the accounts receivable balance included amounts from two customers that totaled 46% of total accounts receivable and at December 31, 2022, the accounts receivable balance included amounts from two customers that totaled 66% of total accounts receivable. Sales concentration Revenue from a single customer in any one period can exceed 10% of our total revenues. During the three months ended June 30, 2023, four customers exceeded 10% of revenues, representing 16%, 16%, 11% and 10% of revenues, and during the six months ended June 30, 2023, two customers exceeded 10%, representing 21% and 16% of revenues. During the three months ended June 30, 2022, two customers exceeded 10% of revenues, representing 24% and 15% of revenues, and during the six months ended June 30, 2022, two customers exceeded 10%, representing 16% and 12% of revenues.

Note 3 - Concentration of Credit Risk

6 Months Ended

Jun. 30, 2023

Concentration Risk Disclosure [Text Block]

NOTE 3: CONCENTRATION OF CREDIT RISK

Cash and cash equivalents

The Company had cash and cash equivalents of $13.0 million and $14.4 million at June 30, 2023 and December 31, 2022, respectively. The Company invests excess cash in U.S. treasury bills, certificates of deposit or deposit accounts, all with maturities of less than three months. Cash equivalents consisting of U.S. treasury bills were $10.0 million and $11.7 million at June 30, 2023 and December 31, 2022, respectively.

The Company places most of its temporary cash investments in the United States with financial institutions, which from time to time may exceed the Federal Deposit Insurance Corporation limit. The amount at risk at June 30, 2023 and December 31, 2022 was $2.6 million and $1.5 million, respectively. The Company’s cash balance at its Tantaline subsidiary based in Denmark exceeded the government guarantee limit by approximately $0.5 million at December 31, 2022.

Account receivable

The Company sells products and services to various companies across several industries in the ordinary course of business. The Company performs ongoing credit evaluations to assess the probability of accounts receivable collection based on a number of factors, including past transaction experience, evaluation of their credit history and review of the invoicing terms of the contract to determine the financial strength of its customers.

Accounts receivable are presented net of an allowance for doubtful accounts of approximately $36,000 at both June 30, 2023 and December 31, 2022. The allowance is based on prior experience and management’s evaluation of the collectability of accounts receivable. Measurement of credit losses requires consideration of historical loss experience, including the need to adjust for changing business conditions, and judgments about the probable effects of relevant observable data, including present economic conditions such as delinquency rates and the financial health of specific customers. Future changes to the estimated allowance for doubtful accounts could be material to our results of operations and financial condition.

At June 30, 2023, the accounts receivable balance included amounts from two customers that totaled 46% of total accounts receivable and at December 31, 2022, the accounts receivable balance included amounts from two customers that totaled 66% of total accounts receivable.

Sales concentration

Revenue from a single customer in any one period can exceed 10% of our total revenues. During the three months ended June 30, 2023, four customers exceeded 10% of revenues, representing 16%, 16%, 11% and 10% of revenues, and during the six months ended June 30, 2023, two customers exceeded 10%, representing 21% and 16% of revenues.

During the three months ended June 30, 2022, two customers exceeded 10% of revenues, representing 24% and 15% of revenues, and during the six months ended June 30, 2022, two customers exceeded 10%, representing 16% and 12% of revenues.