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Note 4 - Debt (Details Textual)
$ in Thousands
 12 Months Ended
May 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
KeyBank [Member] | Revolving Credit Facility [Member]    
Line of Credit Facility, Maximum Borrowing Capacity $ 30,000  
Line of Credit Facility Maximum Borrowing Capacity May Be Increased to 50,000  
Long-term Line of Credit, Total   $ 0
Minimum Fixed Charge Coverage Ratio   1.15
Minimum Tangible Net Worth   $ 40,000
Letters of Credit Outstanding, Amount   0
KeyBank [Member] | Letter of Credit [Member]    
Line of Credit Facility, Maximum Borrowing Capacity $ 1,500  
PNC Bank [Member] | Revolving Credit Facility [Member]    
Long-term Line of Credit, Total   $ 0