Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Stockholders' Equity (Details Textual)

Note 11 - Stockholders' Equity (Details Textual)	3 Months Ended		12 Months Ended
Note 11 - Stockholders' Equity (Details Textual)	Mar. 31, 2024 USD ($) shares	Mar. 31, 2023 USD ($)	Dec. 31, 2019 shares	Dec. 31, 2023 shares
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)	456,646
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation \| $	$ 360,000
Proceeds from Issuance of Common Stock \| $	$ 2,126,000	$ 1,989,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)	1,904,252			1,420,454
The 2014 Stock Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)	635,215
The 2019 Stock Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)	1,269,037
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)			18,500,000
The 2019 Stock Incentive Plan [Member] \| Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)			10 years
ATM [Member]
Stock Issued During Period, Shares, New Issues (in shares)	4,155,611
Proceeds from Issuance of Common Stock \| $	$ 2,100,000
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	111,522
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value \| $	$ 60,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Number of Installments	3
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	3 years
Management and Employees [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)	1,056,082
Management and Employees [Member] \| Reissued Treasury Stock [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)	428,566
Board Members [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)	39,773