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Note 11 - Capital Stock and Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		12 Months Ended
	May 16, 2019	Apr. 02, 2018	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2000	Dec. 31, 2019	May 18, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date					85.00%
Increase In Number Of Shares Authorized For Issuance Under Stock Option And Incentive Plan (in shares)	350,000	3,400,000
Employee Stock Purchase Plan Shares Authorized (in shares)							1,400,000
Employee Stock Ownership Plan (ESOP), Shares in ESOP, Total (in shares)						1,081,404
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)			0
Employee Stock Ownership Plan, Shares Available for Issuance (in shares)			318,596
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)		20,908,929	275,419
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			$ 3.3
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			2 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)			$ 1.18
Deferred Compensation Arrangement with Individual, Maximum Contractual Term (Year)			10 years
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)			4,222,745	3,691,304
Deferred stock awards of Market Condition RSU, Approved 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)			529,491
Maximum Percentage Of Target, Number of Restricted Stock Units			150.00%
Share-based Payment Arrangement, Option [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)			1 year
Share-based Payment Arrangement, Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)			4 years

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