Note 9 - Income Taxes Income Tax (Details)	Mar. 31, 2019 USD ($)
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 2,100,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local, Net of Federal Benefit	67,700,000
US Treasury Securities
Operating Loss Carryforwards [Line Items]
Debt Securities	0
State and Local NOL Carryforwards
Operating Loss Carryforwards [Line Items]
Valuation Allowance, Amount	$ 64,400,000