Note 3 - Summary of Significant Accounting Policies (Details) - USD ($)	3 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Note 3 - Summary of Significant Accounting Policies (Details) [Line Items]
Extended Product Warranty Accrual	$ 477,280
Recognition of Deferred Revenue	19,491	$ 8,933
Revenues	3,306,462	1,814,214
Operating Lease, Liability	459,272
Repairs and Calibration [Member]
Note 3 - Summary of Significant Accounting Policies (Details) [Line Items]
Revenues	422,856	332,699
Replacement Parts [Member]
Note 3 - Summary of Significant Accounting Policies (Details) [Line Items]
Revenues	64,052	47,625
Extended Warranty [Member]
Note 3 - Summary of Significant Accounting Policies (Details) [Line Items]
Revenues	$ 19,491	$ 8,933

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Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard product warranty liability.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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The amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. For cash flows, this element primarily pertains to amortization of deferred credits on long-term arrangements. As a noncash item, it is deducted from net income when calculating cash provided by or used in operations using the indirect method.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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