Note 17 - Commitments and Contingencies	12 Months Ended
Mar. 31, 2022
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	17. Commitments and Contingencies Purchase Commitments The Company periodically enters into non-cancelable purchase contracts in order to ensure the availability of materials to support production of its products. Purchase commitments represent enforceable and legally binding agreements with suppliers to purchase goods or services. The Company periodically assesses the need to provide for impairment on these purchase contracts and records a loss on purchase commitments when required. Lease Commitments During the year ended March 31, 2022 and 2021 all leases were recorded in selling, general and administrative expense. See Note 15, "Leases" for further details. *Legal Contingencies* From time to time, the Company is involved in legal and administrative proceedings and claims of various types. The Company records a liability in its consolidated financial statements for these matters when a loss is known or considered probable and the amount can be reasonably estimated. The Company reviews these estimates each accounting period as additional information is known and adjusts the loss provision when appropriate. If a matter is both probable to result in a liability and the amounts of loss can be reasonably estimated, the Company estimates and discloses the possible loss or range of loss to the extent necessary to make the consolidated financial statements not misleading. If the loss is not probable or cannot be reasonably estimated, a liability is not recorded in its consolidated financial statements. *Other* The Company enters into long-term construction contracts with customers that require the Company to obtain performance bonds. The Company is required to deposit an amount equivalent to some or all the face amount of the performance bonds into an escrow account until the termination of the bond. When the performance conditions are met, amounts deposited as collateral for the performance bonds are returned to the Company. In addition, the Company has various contractual arrangements in which minimum quantities of goods or services have been committed to be purchased on an annual basis. As of March 31, 2022, the Company had $6.1 million of restricted cash included in long-term assets and $2.8 million of restricted cash in current assets. These amounts included in restricted cash primarily represent deposits to secure letters of credit for various supply contracts or collateral deposits including the irrevocable letter of credit in the amount of $5.0 million to secure certain of the Company’s obligations under the Subcontract Agreement with Commonwealth Edison Company. These deposits are held in interest bearing accounts.

Note 17 - Commitments and Contingencies

12 Months Ended

Mar. 31, 2022

Commitments and Contingencies Disclosure [Text Block]

17. Commitments and Contingencies

Purchase Commitments

The Company periodically enters into non-cancelable purchase contracts in order to ensure the availability of materials to support production of its products. Purchase commitments represent enforceable and legally binding agreements with suppliers to purchase goods or services. The Company periodically assesses the need to provide for impairment on these purchase contracts and records a loss on purchase commitments when required.

Lease Commitments

During the year ended March 31, 2022 and 2021 all leases were recorded in selling, general and administrative expense. See Note 15, "Leases" for further details.

Legal Contingencies

From time to time, the Company is involved in legal and administrative proceedings and claims of various types. The Company records a liability in its consolidated financial statements for these matters when a loss is known or considered probable and the amount can be reasonably estimated. The Company reviews these estimates each accounting period as additional information is known and adjusts the loss provision when appropriate. If a matter is both probable to result in a liability and the amounts of loss can be reasonably estimated, the Company estimates and discloses the possible loss or range of loss to the extent necessary to make the consolidated financial statements not misleading. If the loss is not probable or cannot be reasonably estimated, a liability is not recorded in its consolidated financial statements.

Other

The Company enters into long-term construction contracts with customers that require the Company to obtain performance bonds. The Company is required to deposit an amount equivalent to some or all the face amount of the performance bonds into an escrow account until the termination of the bond. When the performance conditions are met, amounts deposited as collateral for the performance bonds are returned to the Company. In addition, the Company has various contractual arrangements in which minimum quantities of goods or services have been committed to be purchased on an annual basis.

As of March 31, 2022, the Company had $6.1 million of restricted cash included in long-term assets and $2.8 million of restricted cash in current assets. These amounts included in restricted cash primarily represent deposits to secure letters of credit for various supply contracts or collateral deposits including the irrevocable letter of credit in the amount of $5.0 million to secure certain of the Company’s obligations under the Subcontract Agreement with Commonwealth Edison Company. These deposits are held in interest bearing accounts.