Note 8 - Revolving Credit Agreement - Interest Rate Margins (Details) - KeyBank [Member] - Revolving Credit Facility [Member]	10 Months Ended	26 Months Ended
	Apr. 01, 2018	May 30, 2020
Scenario, Forecast [Member] | Leverage Ratio Less Than 1.5 [Member]
Applicable basis points for unused fee		0.20%
Scenario, Forecast [Member] | Leverage Ratio Between 1.5 and 2.5 [Member]
Applicable basis points for unused fee		0.15%
Scenario, Forecast [Member] | Leverage Ratio Greater than 2.5 [Member]
Applicable basis points for unused fee		0.10%
London Interbank Offered Rate (LIBOR) [Member]
Interest rate margin on outstanding borrowings	1.85%
Applicable basis points for unused fee	0.20%
London Interbank Offered Rate (LIBOR) [Member] | Scenario, Forecast [Member] | Leverage Ratio Less Than 1.5 [Member]
Interest rate margin on outstanding borrowings		1.85%
London Interbank Offered Rate (LIBOR) [Member] | Scenario, Forecast [Member] | Leverage Ratio Between 1.5 and 2.5 [Member]
Interest rate margin on outstanding borrowings		2.00%
London Interbank Offered Rate (LIBOR) [Member] | Scenario, Forecast [Member] | Leverage Ratio Greater than 2.5 [Member]
Interest rate margin on outstanding borrowings		2.15%
Base Rate [Member]
Interest rate margin on outstanding borrowings	(0.50%)
Base Rate [Member] | Scenario, Forecast [Member] | Leverage Ratio Less Than 1.5 [Member]
Interest rate margin on outstanding borrowings		(0.50%)
Base Rate [Member] | Scenario, Forecast [Member] | Leverage Ratio Between 1.5 and 2.5 [Member]
Interest rate margin on outstanding borrowings		(0.25%)
Base Rate [Member] | Scenario, Forecast [Member] | Leverage Ratio Greater than 2.5 [Member]
Interest rate margin on outstanding borrowings		0.00%