Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual)
$ / shares in Units, $ in Thousands |
3 Months Ended |
12 Months Ended |
|
Jun. 30, 2021
USD ($)
|
Dec. 31, 2021
USD ($)
$ / shares
shares
|
Dec. 31, 2020
USD ($)
$ / shares
shares
|
| Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |
|
$ 0.0001
|
$ 0.0001
|
| Number of Wholly-owned Subsidiaries |
|
1
|
|
| Short-term Investment, Allowance for Credit Loss |
|
$ 0
|
$ 0
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares |
|
5,596,853
|
7,566,502
|
| Accounts Receivable, Allowance for Credit Loss, Ending Balance |
|
$ 134
|
$ 10
|
| Inventory Valuation Reserves, Ending Balance |
|
$ 0
|
|
| Property, Plant and Equipment, Useful Life (Year) |
|
3 years
|
|
| Impairment, Long-Lived Asset, Held-for-Use, Total |
|
$ 0
|
0
|
| Advertising Expense |
|
145
|
287
|
| Marketing Expense |
|
924
|
747
|
| Cost of Revenue, Total |
|
5,734
|
2,601
|
| Revenue from Contract with Customer, Including Assessed Tax |
|
7,381
|
3,868
|
| Product Line Exit Expense |
|
747
|
0
|
| Write-off, Inventory Cost |
|
641
|
|
| Retiring Cost |
|
106
|
|
| Standard Product Warranty Accrual, Ending Balance |
|
96
|
48
|
| Shipping and Handling [Member] |
|
|
|
| Cost of Revenue, Total |
|
167
|
75
|
| Revenue from Contract with Customer, Including Assessed Tax |
|
88
|
$ 63
|
| Computer Software, Intangible Asset [Member] |
|
|
|
| Impairment, Long-Lived Asset, Held-for-Use, Total |
$ 170
|
$ 170
|
|
| Minimum [Member] |
|
|
|
| Finite-Lived Intangible Asset, Useful Life (Year) |
|
1 year
|
|
| Maximum [Member] |
|
|
|
| Finite-Lived Intangible Asset, Useful Life (Year) |
|
20 years
|
|