Note 3 - Business Combination (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended			3 Months Ended			5 Months Ended	6 Months Ended		12 Months Ended
	Jun. 15, 2024	Jul. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Sep. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2025	Apr. 17, 2024
Common Stock, No Par Value (in dollars per share)						$ 0					$ 0	$ 0
Amortization of Intangible Assets					$ 145		$ 178		$ 272	$ 208
Depreciation					$ 719		306		$ 1,200	$ 367
Amplex Holdings [Member]
Investment, Shares Acquired During the Period (in shares)	1,674	4,120	2,583	1,674
Investment, Shares Acquired, Price Per Share (in dollars per share)	$ 1,792.55	$ 1,092.26	$ 1,742.16	$ 1,792.55
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	$ 3,000	$ 4,500	$ 4,500	$ 3,000
Subsidiary, Ownership Percentage, Parent	56.50%	66.40%	60.90%	56.50%	66.40%			56.50%	66.40%
Conversion of Principal and Accrued Interest Into Amplex Shares [Member]
Debt Conversion, Original Debt, Amount	$ 800							$ 800
Debt Conversion, Converted Instrument, Shares Issued (in shares)	421							421
Debt Conversion, Converted Instrument, Shares Issued, Price Per Share (in dollars per share)	$ 1,792.55							$ 1,792.55
Amplex Holdings [Member]
Business Combination, Voting Equity Interest Acquired, Percentage	51.00%
Common Stock, No Par Value (in dollars per share)	$ 0
Business Combination, Consideration Transferred	$ 18,400
Business Combination, Goodwill, Expected Tax Deductible, Amount	$ 0
Business Combination, Acquisition-Related Cost, Expense											$ 1,100
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles						$ (7,000)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment						4,500
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cash and Cash Equivalents						200
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Liabilities						500
Goodwill, Measurement Period Adjustment						$ 1,800
Amortization of Intangible Assets							170				500
Depreciation							544				$ 1,500
Amplex Holdings [Member] | Revision of Prior Period, Adjustment [Member]
Amortization of Intangible Assets							(39)
Depreciation							207
Amplex Holdings [Member] | Previously Reported [Member]
Amortization of Intangible Assets							208
Depreciation							$ 337