Note 15 - Debt (Details Textual) - Revolving Line of Credit [Member] - Wells Fargo [Member]	May 30, 2018 USD ($)
Line of Credit Facility, Maximum Borrowing Capacity	$ 25,000,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage, If Leverage Ratio is Less Than 1.00	0.25%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage, If Leverage Ratio is Equal to or Greater Than 1.00 But Less Than 2.00	0.30%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage, If Leverage Ratio is Equal To or Greater Than 2.00	0.35%
Leverage Ratio, Maximum	2.5
Debt Instrument, Minimum Adjusted EBITDA	$ 10,000,000
Minimum [Member]
Line of Credit Facility, Current Borrowing Capacity	5,000,000
Maximum [Member]
Line of Credit Facility, Current Borrowing Capacity	$ 25,000,000