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Note 5 - Stockholders' Equity (Details Textual) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2026	Mar. 31, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Feb. 26, 2026	Jan. 31, 2026	Jan. 28, 2026	Dec. 31, 2025	Mar. 03, 2025	Jan. 31, 2025	May 02, 2024	Mar. 19, 2024	Dec. 20, 2021
Treasury Stock, Shares, Acquired (in shares)	0			264,000
Treasury Stock, Value, Acquired, Cost Method		$ 262,000	$ 2,565,000	$ 262,036
Share Repurchase Program, Remaining Authorized, Amount	$ 4,928,833			$ 4,928,833
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.0001			$ 0.0001					$ 0.0001
Proceeds from Issuance of Common Stock				$ 0	$ 11,143,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)	717,941			717,941			1,521,941				717,941
Share-Based Compensation Arrangement by Share-Based Payment Award, Annual Percentage Increase											5.00%			5.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)	98,444			98,444
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)				10 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)				10 years
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 800,000			$ 800,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				9 months 18 days
Tunim Purchase Agreement [Member]
Equity Offering, Amount Available	$ 5,998,000			$ 5,998,000				$ 6,000,000
Beneficial Ownership Limitation								19.99%
Stock Issued During Period, Shares, New Issues (in shares)	0			2,000
Proceeds from Issuance or Sale of Equity				$ 2,000
Tunim Purchase Agreement [Member] \| Minimum [Member]
Equity Offering, Purchase Price, Percentage of VWAP								95.00%
Tunim Purchase Agreement [Member] \| Maximum [Member]
Equity Offering, Purchase Price, Percentage of VWAP								97.00%
A T M Facility [Member]
Stock Issued During Period, Shares, New Issues (in shares)	0		0	0	9,719,173
Common Stock, Par or Stated Value Per Share (in dollars per share)													$ 0.0001
Equity Issuance, Maximum Aggregate Sales Price													$ 50,000,000
Commission Fee, Percentage												3.00%
Proceeds from Issuance of Common Stock				$ 0	$ 9,700,000
Repurchase Program 2025 [Member]
Share Repurchase Program, Authorized, Amount										$ 5,000,000
Treasury Stock, Shares, Acquired (in shares)				199,000
Repurchase Program 2026 [Member]
Share Repurchase Program, Authorized, Amount						$ 5,000,000
Treasury Stock, Shares, Acquired (in shares)				65,000