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Note 4 - Financing Arrangements - Long-term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Long-term debt gross $ 4,441 $ 4,612
Discount on Devicix Notes Payable (23)
Debt issuance Costs (162) (185)
Total long-term debt 4,279 4,404
Current maturities of long-term debt (878) (780) [1]
Long-term debt - net of current maturities 3,401 3,624 [1]
Real Estate Term Note [Member]    
Long-term debt gross 4,004 4,253
Line of Credit [Member]    
Long-term debt gross 437
First Unsecured Subordinated Promissory Notes Payable [Member]    
Long-term debt gross 156
Second Unsecured Subordinated Promissory Notes Payable [Member]    
Long-term debt gross $ 203
[1] The balance sheet at December 31, 2018 has been derived from the audited financial statements at that date.