Quarterly report [Sections 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)	Jul. 22, 2025 shares	May 15, 2025 USD ($) shares	Mar. 31, 2026 USD ($) shares	Mar. 31, 2025 USD ($) shares	Dec. 31, 2019 shares	Dec. 31, 2025 USD ($)	Oct. 16, 2025 USD ($)	Aug. 22, 2024 USD ($)
Share-Based Payment Arrangement, Expense \| $			$ 450,000	$ 701,000
The 2019 Stock Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)	400,000				140,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)	260,000
The 2019 Stock Incentive Plan [Member] \| Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)					10 years
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)			53,385
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value \| $			$ 296,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month)			6 months
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Number of Installments			3
Performance Stock Units (PSUs) [Member]
Share-Based Payment Arrangement, Expense \| $			$ 121,000
Management and Employees [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)			28,106	5,835
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)			11,792	2,648
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation \| $			$ 56,000	$ 67,000
Management and Employees [Member] \| Reissued Treasury Stock [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)			10,413	2,942
Director [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)			4,349	335
ATM [Member]
Equity Offering, Maximum Amount \| $						$ 50,000,000	$ 30,000,000	$ 30,000,000
Equity Offering, Compensation From Gross Proceeds, Percent								2.50%
Stock Issued During Period, Shares, New Issues (in shares)			198,780	59,648
Proceeds from Issuance of Common Stock \| $			$ 1,295,000	$ 1,214,000
Equity Offering, Remaining Availability \| $			$ 48,600,000
ELOC [Member]
Equity Offering, Maximum Amount \| $		$ 10,000,000
Equity Offering, Period (Month)		24 months
Equity Offering, Maximum Shares (in shares)		177,283